Full opinion text
Opinion WRIGHT, C. J. In this case we consider the validity of an initiative amendment to the Charter of the City of Berkeley providing for residential rent control within that city. In a class action brought by plaintiff landlords the superior court declared the amendment void and enjoined the city from enforcing it principally on the ground that the evidence at a lengthy trial showed that the city was not faced with a serious public emergency of the sort the court deemed constitutionally prerequisite to imposition of rent controls under the police power. As hereinafter explained we have concluded that the existence of such an emergency is no more necessary for rent control than for other forms of economic regulation which are constitutionally valid when reasonably related to the furtherance of a legitimate governmental purpose, and that the facts established,at the trial did not preclude the city from legislating on the subject of residential rent control. We have also concluded that state law does not preempt the field of placing maximum limits on residential rents and that an enactment for that purpose could properly take the form of an initiative amendment to the city charter. However, we also hold for reasons hereinafter stated that the Berkeley Charter amendment transgresses the constitutional limits of the police power not because of its objectives but because certain procedures it provides would impose heavy burdens upon landlords not reasonably related to the accomplishment of those objectives. The amendment would require a blanket rollback of all controlled rents to those in effect on August 15, 1971, (or to any lower rents in effect thereafter) and would prohibit any adjustments in maximum rents except under a unit-by-unit procedure which for reasons to be explained would be incapable of effecting necessary adjustments throughout the city within any reasonable period of time. Even if we were to adopt counsel’s suggestion of a judicial postponement of the rent rollback date to one that is more current, the absence of adequate adjustment procedures would leave arbitrary maximum rents in effect far longer than would be reasonably necessary to the amendment’s stated purpose of alleviating hardship caused by rising and exorbitant rents exploiting a housing shortage in the city. In addition to controlling rents the charter amendment imposes prerequisites and restrictions upon eviction proceedings. As hereinafter explained we concur with the trial court’s view that the charter amendment’s requirement that the landlord obtain a “certificate of eviction” from the city before seeking to recover possession of a rent-controlled unit is invalid in that it conflicts with state law prescribing procedures for evicting tenants. In the absence of these procedural restrictions the charter amendment’s prohibition against dispossession of tenants who are in good standing apart from the expiration of their terms would be a permissible means of enforcing validly imposed rent ceilings. However, such prohibition necessarily falls along with the charter amendment’s constitutionally defective mechanism for adjusting maximum rents. Accordingly we affirm the judgment. The parties before us include not only the plaintiff landlords and defendant city but also a group of organizations and individuals who filed a complaint in intervention praying that plaintiffs be denied all relief. The interveners generally represent two types of interests: (1) students, disabled persons and other low-income tenants occupying rental housing in Berkeley and (2) Berkeley residents asserting environmental interests in preserving the existing housing stock and preventing an exodus of low-income residents. The interveners participated in the trial and have filed an appeal separate from that of defendant. The record on appeal is confined to the clerk’s transcript. The regularity of the proceedings by which the charter amendment was adopted is not questioned. The amendment was proposed by initiative, was adopted by the city electorate on June 6, 1972, and apart from questions of its substantive validity took effect on August 2, 1972, when it was ratified by the Legislature. Its full text is printed in the chapter laws (Stats. 1972 (Reg. Sess.) res. ch. 96, p. 3372) and is set out in the appendix hereto. The charter amendment declares that its purpose is to alleviate the hardships caused by a “serious public emergency” endangering the public health and welfare, especially that of “the poor, minorities, students and the aged,” and affecting a substantial proportion of Berkeley tenants. The emergency is declared to consist of “[a] growing shortage of housing units resulting in a critically low vacancy rate, rapidly rising and exorbitant rents exploiting this shortage, and the continuing deterioration of the existing housing stock.” (§ l.) The measure provides for a rent control board (Board) of five popularly elected commissioners (§ 3) to fix and adjust maximum rents for all controlled dwelling units, administer restrictions on eviction proceedings, and exercise other regulatory and enforcement powers. Controls apply to all rented houses, apartments and rooming units other than (1) accommodations rented primarily to transient guests for periods of less than 14 days, (2) rental units in nonprofit homes for the aged or cooperatives, certain religious or medical facilities, or dormitories of an institution of higher learning, and (3) governmentally owned, operated, managed or subsidized rental housing. (§ 2, subds. (c), (h).) The Board is required to fix a “base rent” for all controlled units by “administering] a rollback of rents” to the lowest level in effect on or after August 15, 1971, or to a comparable prevailing level if the unit was not rented on that date. (§ 4, subd. (a).) The rolled-back base rent becomes the maximum rent subject only to “individual rent adjustments.” (§ 5.) The Board is prohibited from granting any adjustment of the maximum rent even for an individual unit until it receives a petition from the unit’s landlord or tenant and considers the petition at an adjustment hearing. (§ 6, subd. (a).) Any landlord’s petition must be accompanied by a certification from the city’s building inspection service showing full compliance with state and city housing codes based on an inspection made within six months. The certification is only prima facie evidence of compliance and the Board may refuse an upward rent adjustment if it finds from other competent evidence that the rental unit is not in compliance “due to the landlord’s failure to provide normal and adequate housing services.” (§ 5.) In considering a landlord’s or tenant’s petition for rent adjustment the Board must consider “relevant factors including but not limited to” (1) increases or decreases in property taxes, in operating or maintenance expenses and in rented living space or furnishings; (2) capital improvements; (3) extraordinary deterioration of the rented unit; and (4) any failure by the landlord to provide adequate housing services. (§ 5.) Although the parties must be given 16 days’ notice of the hearing on a rent adjustment petition (§ 6, subd. (b)), there is no expressed limit on the length of time within which the hearing may be held after the petition is filed. Hearings are open to the public and the parties may be assisted by attorneys, tenant union representatives, or any other persons they designate. (§ 6, subds. (d), (e).) The Board’s official public record of the hearing, constituting “the exclusive record for decision,” must include all exhibits required to be filed or in evidence, a list of participants, a summary of testimony, a statement of all materials officially noticed, findings of fact, rulings on exceptions or objections, and all recommended and final decisions and orders together with the reasons for each. (§ 6, subd. (f).) Any rent adjustment granted must be “supported by the preponderance of the evidence submitted at the hearing.” (§ 6, subd. (g).) Petitions on rent-controlled units in the same building may be consolidated “with the written consent of a majority of the tenants.” (§ 6, subd. (h).) Three commissioners constitute a quorum of the Board and three affirmative votes are required for all rulings and decisions. (§ 3, subd. (i).) The Board must hold two regular meetings a month, and although there is no limit on the number of its special meetings, each commissioner’s compensation of $50 per meeting is limited to $2,400 per year. (§ 3, subds. (h), (k).) The Board is given additional responsibilities of acting upon applications for certificates of eviction submitted by landlords who desire to repossess rent-controlled units. (§ 7.) The charter amendment’s provisions for this procedure and for. limitations on the grounds for eviction are discussed hereinafter. City’s Power to Provide for Rent Control by Initiative Amendment to Its Charter It is contended that the defendant city was barred from imposing rent controls by the conceded absence of any state statute authorizing local legislation on the subject. As will be hereinafter discussed, the regulation of rents is proper only insofar as it is a valid exercise of the police power. The Constitution itself confers upon all cities and counties the power to “make and enforce within [their] limits all local, police, sanitary, and other ordinances and regulations not in conflict with general laws.” (Cal. Const., art. XI, § 7.) A city’s police power under this provision can be applied only within its own territory and is subject to displacement by general state law but otherwise is as broad as the police power exercisable by the Legislature itself. (Stanislaus Co. etc. Assn. v. Stanislaus (1937) 8 Cal.2d 378, 383-384 [65 P.2d 1305]; In re Maas (1933) 219 Cal. 422, 425 [27 P.2d 373].) The decisions cited in support of the contended necessity for statutory authorization of municipal rent control measures are all from other jurisdictions and make clear that the involved cities did not have any broad grant of police power such as that enjoyed by California cities. (See Old Colony Gardens, Inc. v. City of Stamford (1959) 147 Conn. 60 [156 A.2d 515] (legislature’s prior termination of municipal rent controls negated any implication of rent control power in city charter); City of Miami Beach v. Fleetwood Hotel, Inc. (Fla. 1972) 261 So.2d 801 (city charter powers strictly construed); Ambassador East, Inc. v. City of Chicago (1948) 399 Ill. 359, 365-367 [77 N.E.2d 803]; Marshal House, Inc. v. Rent Review, etc. Board (1970) 357 Mass. 709 [260 N.E.2d 200] (proscription against municipal enactment of “private or civil law governing civil relationships except as an incident to ... an independent municipal power”); Tietjens v. City of St. Louis (1949) 359 Mo. 439 [222 S.W.2d 70] (“[a] city has no inherent police power”); Wagner v. City of Newark (1957) 24 N.J. 467 [132 A.2d 794].) On the other hand, the decisions construing grants of municipal power comparable in breadth to the police power of California cities under article XI, section 7, of our Constitution hold that such powers encompass the imposition of local rent controls. (See Heubeck v. City of Baltimore (1954) 205 Md. 203 [107 A.2d 99] (grant of “Police Power to the same extent as the State has or could exercise”); Inganamort v. Borough of Fort Lee (1973) 62 N.J. 521, 534, 536 [303 A.2d 298] (grant of “greatest power of local self-government consistent with the Constitution”; “ ‘grant of broad general police powers to municipalities’ ”); Warren v. City of Philadelphia (1955) 382 Pa. 380, 384 [115 A.2d 218] (grant of “all powers relating to its municipal functions ... to the full extent that the General Assembly may legislate in reference thereto”).) Defendant and interveners properly concede that rent control is not a municipal affair as to which a charter provision would prevail over general state law under article XI, section 5 of the Constitution. (See Bishop v. City of San Jose (1969) I Cal.3d 56, 61-63 [81 Cal.Rptr. 465, 460 P.2d 137]; Butterworth v. Boyd (1938) 12 Cal.2d 140, 146-148 [82 P.2d 434, 126 A.L.R. 838].) Accordingly the charter amendment cannot be given effect to the extent that it conflicts with general laws either directly or by entering a field which general laws are intended to occupy to the exclusion of municipal regulation. (Lancaster v. Municipal Court (1972) 6 Cal.3d 805 [100 Cal.Rptr. 609, 494 P.2d 681]; City of Santa Clara v. Von Raesfeld (1970) 3 Cal.3d 239, 245-246 [90 Cal.Rptr. 8, 474 P.2d 976]; Galvan v. Superior Court (1969) 70 Cal.2d 851, 859 [76 Cal.Rptr. 642, 452 P.2d 930]; In re Hubbard (1964) 62 Cal.2d 119, 127-128 [41 Cal.Rptr. 393, 396 P.2d 809].) The fact that the charter amendment prohibits landlords of residential units within the city from charging more than the maximum rents prescribed by a municipal rent control board under specified standards does not bring the amendment into conflict with general state law. California has no state rent control statute. There is of course extensive state legislation governing many aspects of landlord-tenant relationships, some of which pertain specifically to the determination or payment of rent. (See, e.g., Civ. Code, § 827 (changing rent terms in tenancies of one month or less); Civ. Code, § 1935 (apportionment of rent); Civ. Code, § 1942 (right to deduct from rent for cost of repairs); Civ. Code, § 1942.5 (restricting retaliatory rent increases); Civ. Code, § 1947 (when rent is payable); Civ. Code, § 1950.5 (advance payments of rent).) But neither the quantity nor the content of these statutes establishes or implies any legislative intent to exclude municipal regulation of the amount of rent based on local conditions. (See Galvan v. Superior Court, supra, 70 Cal.2d at pp. 860-864.) The charter amendment’s purpose of preventing exploitation of a housing shortage through excessive rent charges is distinct from the purpose of any state legislation, and the imposition of rent ceilings does not materially interfere with any state legislative purpose. (See People v. Mueller (1970) 8 Cal.App.3d 949, 954 [88 Cal.Rptr. 157].) Whether the relevant field be deemed to be rent control as such or a broader aspect of landlord-tenant relations (see California Water & Telephone Co. v. County of Los Angeles (1967) 253 Cal.App.2d 16, 27-28 [61 Cal.Rptr. 618]), there is no legislative indication of “a paramount state concern [which] will not tolerate further or additional local action.” (In re Hubbard, supra, 62 Cal.2d at p. 128.) It is contended that rent control is not within the municipal police power because it is “private law” purporting to regulate private civil relationships. Such an exception to municipal powers has received support from some commentators and was included in the “home rule” article of the Massachusetts Constitution in the form of a provision denying cities any inherent power “to enact private or civil law governing civil relationships except as an incident to an exercise of an independent municipal power.” (Mass. Const., Amends., art. 89, § 7, subd. (5).) The Massachusetts Supreme Judicial Court construed this provision as preventing cities from enacting rent control measures in the absence of enabling legislation. (Marshal House, Inc. v. Rent Review, etc. Board, supra, 357 Mass. 709.) The California Constitution contains no such “private law” exception to municipal powers. The fact that municipal imposition of rent ceilings necessarily affects private civil relationships by no means makes it unique among city police regulations. For example, a city ordinance specifying the liability insurance to be carried by a bus operator may give rise to a direct right of action against the insurer for injuries caused by the operator’s negligence (Milliron v. Dittman (1919) 180 Cal. 443 [181 P. 779]), and violation of municipal building or housing codes may establish negligence in a tort action (Finnegan v. Royal Realty Co. (1950) 35 Cal.2d 409 [218 P.2d 17]), render a lease unenforceable as an illegal contract (Howell v. City of Hamburg Co. (1913) 165 Cal. 172, 176 [131 P. 130]), or give rise to a defense of breach of warranty of habitability in an action for rent or for recovery of possession based on nonpayment of rent (Green v. Superior Court (1974) 10 Cal.3d 616, 637-638 [111 Cal.Rptr. 704, 517 P.2d 1168]; Hinson v. Delis (1972) 26 Cal.App.3d 62 [102 Cal.Rptr. 661]). Thus, the mere fact that a city rent control measure would nullify tenants’ liabilities to landlords for rent in excess of stated ceilings does not render the measure invalid. It is contended that the charter amendment even if otherwise valid could not be adopted through the initiative process without the concurrence of the city council. Several arguments are advanced in support of this contention; none of them has merit. It is argued that the charter amendment’s adoption violates the principle that the initiative is ordinarily deemed inapplicable where “the inevitable effect would be greatly to impair or wholly destroy the efficacy of some other governmental power.” (Chase v. Kalber (1915) 28 Cal.App. 561, 569-570 [153 P. 397]; accord, Simpson v. Hite (1950) 36 Cal.2d 125, 134 [222 P.2d 225].) The governmental power that it is asserted the charter amendment would impair is the city council’s power to raise tax revenues to carry on the municipal government. Past decisions invalidating initiative or referendum measures to repeal local tax levies have indicated a policy of resolving any doubts in the scope of the initiative or referendum in a manner that avoids interference with a local legislative body’s responsibilities for fiscal management. (Geiger v. Board of Supervisors (1957) 48 Cal.2d 832, 839-840 [313 P.2d 545]; Hunt v. Mayor & Council of Riverside (1948) 31 Cal.2d 619, 628-629 [191 P.2d 426]; Campen v. Greiner (1971) 15 Cal.App.3d 836, 843 [93 Cal.Rptr. 525].) Although the rent control measure in no way touches upon the city council’s power to levy taxes, it is theorized that rent control would “cause fiscal chaos in the long run” by impairing the city’s tax base. In support of this theory our attention is drawn to published articles depicting dire consequences attributed to rent control in New York City and other communities on the eastern seaboard. Interveners cite contrary material praising the effects of rent control. Although these disputed matters would be appropriate for consideration by a legislative body or the electorate in deciding whether to adopt a rent control proposal, they cannot be relied upon for the purpose urged here. Many sorts of initiative measures arguably affect the property tax base (e.g., the initiative zoning ordinances recently upheld in San Diego Bldg. Contractors Assn. v. City Council, supra, 13 Cal.3d 205, and Builders Assn, of Santa Clara-Santa Cruz Counties v. Superior Court (1974) 13 Cal.3d 225 [118 Cal.Rptr. 158, 529 P.2d 582]) but such speculative consequences do not constitute a prohibited interference by the initiative power with the function of a legislative body. Another objection raised to the use of the initiative procedure to adopt the charter amendment is that the amendment prescribes detailed procedures for carrying out its substantive provisions and thus violates a supposed rule that the initiative cannot deal with administrative (as distinct from legislative) matters. However, the decisions cited in support of this objection concern the entirely different situation of an initiative ordinance that is deemed an improper interference with the local legislative body’s administrative functions assigned to it by a state statute or other controlling instrument containing the legislative policies to be administered. (See Simpson v. Hite, supra, 36 Cal.2d at pp. 133-135; Housing Authority v. Superior Court (1950) 35 Cal.2d 550, 557-559 [219 P.2d 457]; McKevitt v. City of Sacramento (1921) 55 Cal.App. 117, 124 [203 P. 132].) The present charter amendment interferes with no preexisting legislative policy but instead performs the purely legislative function of introducing a new regulatory scheme. It is argued that the use of the initiative process to adopt a municipal rent control measure is precluded by the unavailability to the electorate of factfinding procedures by which a legislative body can ascertain the existence of facts that would warrant the imposition of rent controls. However, the cases relied upon for the argument deal only with factfinding procedures that are attached as conditions precedent to particular grants of legislative powers. Thus the empowering provisions of the relevant statute or charter were construed in those cases as imposing such factfinding prerequisites as ascertainment of the “prevailing wage” before fixing county salaries (Walker v. County of Los Angeles (1961) 55 Cal.2d 626 [12 Cal.Rptr. 671, 361 P.2d 247]), the holding of hearings before enactment of a zoning ordinance by a general law city (Taschner v. City Council (1973) 31 Cal.App.3d 48, 61-64 [107 Cal.Rptr. 214]), or the declaration and existence of a “great necessity or emergency” before exceeding the maximum tax rate (San Christina etc. Co. v. San Francisco (1914) 167 Cal. 762 [141 P. 384]) or of urgency necessitating putting an ordinance into immediate effect (In re Hoffman (1909) 155 Cal. 114, 119 [99 P. 517]). The power of the Berkeley electorate to amend their city charter through the initiative is derived from article XI, section 3, of the Constitution and is free from any such factfinding prerequisite. Accordingly, as we said in another case with reference to an initiative city ordinance, the charter amendment “must be deemed to have been enacted on the basis of any state of facts supporting it that reasonably can be conceived.” (Higgins v. City of Santa Monica (1964) 62 Cal.2d 24, 30 [41 Cal.Rptr. 9, 396 P.2d 41].) Even if the city council itself had proposed the charter amendment (Cal. Const., art. XI, § 3, subd. (b)), we could not probe the council members’ motivations for doing so (County of Los Angeles v. Superior Court (1975) 13 Cal.3d 721, 726-727 [119 Cal.Rptr. 631, 532 P.2d 495]) and would be required to judge the amendment’s validity by its own terms rather than by the motives of or influences upon the legislators (City and County of San Francisco v. Cooper (1975) 13 Cal.3d 898, 913 [120 Cal.Rptr. 707, 534 P.2d 403]). The subjective motivations of the voters who petitioned for and approved the amendment’s adoption are similarly irrelevant' to our inquiry, which is therefore unaffected by any comparison between the factfinding procedures available to the electorate and to the city council. Finally it is argued that initiative enactment of local rent control measures violates landlords’ due process rights because tenants are in the majority and will always vote in favor of rent control as a result of their direct economic interest in the outcome. The fact that the initiative process results in legislation reflecting the will of the majority and imposing certain burdens upon landlords can hardly be deemed a ground for holding the legislation invalid. It is of the essence of the police power to impose reasonable regulations upon private property rights to serve the larger public good. (Queenside Hills Co. v. Saxl (1946) 328 U.S. 80, 82-83 [90 L.Ed. 1096, 1097-1098, 66 S.Ct. 850]; Clemons v. City of Los Angeles (1950) 36 Cal.2d 95, 102 [222 P.2d 439].) Moreover, this can be accomplished by the initiative, as in the case recently before us in which a city electorate initiated and adopted an ordinance that in effect prevented the owners of lots near the ocean from building high-rise structures that would have blocked views from larger areas located farther inland. (See San Diego Bldg. Contractors Assn. v. City Council, supra, 13 Cal.3d.205.) We expressly recognized the propriety of using the initiative process to enact local legislation adversely affecting only a small minority of the population in Dwyer v. City Council (1927) 200 Cal. 505 [253 P. 932], where we rejected a claim that a Berkeley zoning ordinance was beyond the initiative and referendum powers because its sole effect would be to rezone a tiny fraction of the city. We said: “It is a fundamental tenet of the American system of representative government that the legislative power of a municipality resides in the people thereof, and that the right to exercise it has been conferred by them upon their duly chosen representatives. By the enactment of initiative and referendum laws the people have simply withdrawn from the legislative body and reserved to themselves the right to exercise a part of their inherent legislative power. ... It is a characteristic of much legislation, especially in this age of intense specialization of occupations and interests, that it operates, to a greater or less degree, more directly upon one group or section of the population than upon another . . . .” (200 Cal. at p. 513.) “The vice of respondents’ argument consists in placing undue stress upon the sectional interest which residents of a particular district may be expected to have in restrictions more immediately affecting their district and in under-emphasizing the interest of the community as a whole in the existence of a comprehensive zoning plan. It must be presumed that the electorate will act in the interests of the entire city, and of the part to be affected by the proposed legislation. If the law operates more directly upon only a part of the citizens evil intent or design cannot be presumed.” (Italics supplied; 200 Cal. at p. 514.) The scope of the initiative power reserved to the people is to be liberally construed. (Farley v. Healey (1967) 67 Cal.2d 325, 328 [62 Cal.Rptr. 26, 431 P.2d 650]; Blotter v. Farrell (1954) 42 Cal.2d 804, 809 [270 P.2d 481]; Ley v. Dominguez (1931) 212 Cal. 587, 593 [299 P. 713].) Judicial protection of landlords’ rights with respect to rent control enactments such as the present charter amendment lies not in placing arbitrary restrictions upon the initiative power but in measuring the substance of the enactment’s provisions against overriding constitutional and statutory requirements. Conflict Between Charter Amendment’s Eviction Provisions and General Laws The charter amendment imposes two kinds of restraint upon eviction proceedings: It limits the grounds upon which a landlord may bring an action to repossess a rent-controlled unit (§ 7, subd. (a)) and it requires that a landlord obtain a certificate of eviction from the rent control board before seeking such repossession (§ 7, subds. (b)-(g)). These two types of restriction will be considered in order. The permitted grounds for eviction can be grouped into three categories. One category consists of breaches of the tenant’s duties to the landlord: failure to pay rent or to perform an obligation of the tenancy after notice, commission of a nuisance on or of substantial damage to the rented premises, conviction of using the premises for an illegal purpose, refusal of reasonable landlord access for repairs, inspection, or showing to a prospective purchaser, or transferring possession to an unauthorized subtenant. (§ 7, subds. (a)(l)-(4), (6)-(7).) A second categoiy consists of the landlord’s good faith intention to withdraw the unit from the rental housing market for occupancy by the landlord or specified relatives of the landlord (§ 7, subd. (a)(8)), or for demolition or conversion to nonhousing use (§ 7, subd. (a)(9)). The remaining category is the refusal of the tenant holding at the expiration of a lease (“rental housing agreement”) to execute a written renewal or extension for the same duration as the original lease and on terms that are materially the same. (§ 7, subd. (a)(5).) These permitted grounds for eviction appear to cover most if not all of the grounds that would otherwise be available except that of termination of the tenancy. No other omitted grounds have been called to our attention and we assume for present purposes that the effect of the provision is simply to prohibit the eviction of a tenant who is in good standing at the expiration of the tenancy unless the premises are to be withdrawn from the rental housing market or the landlord’s offer of a renewal lease has been refused. This prohibition is a reasonable means of enforcing rent ceilings by preventing landlords from putting out tenants because of their unwillingness to pay illegal amounts of rent or their opposition to applications for increases in rent ceilings. (See Block v. Hirsh (1921) 256 U.S. 135, 157-158 [65 L.Ed. 865, 871-872, 41 S.Ct. 458, 16 A.L.R. 165]; Heubeck v. City of Baltimore, supra, 205 Md. 203,212.) Plaintiffs contend, that any regulation of the grounds for eviction is preempted by general state law. Code of Civil Procedure section 1161, subdivision 1, makes the continuation of a tenant’s possession after expiration of the term a form of unlawful detainer for which the landlord may recover possession in summary proceedings under Code of Civil Procedure section 1164 et seq. However, these statutory provisions are not necessarily in conflict with the charter amendment’s provision forbidding landlords to recover possession upon expiration of a tenancy if the purpose of the statutes is sufficiently distinct from that of the charter amendment. (See Galvan v. Superior Court, supra, 70 Cal.2d 851, 859; People v. Mueller, supra, 8 Cal.App.3d 949, 954.) The purpose of the unlawful detainer statutes is procedural. The statutes implement the landlord’s property rights by permitting him to recover possession once the consensual basis for the tenant’s occupancy is at an end. In contrast the charter amendment’s elimination of particular grounds for eviction is a limitation upon the landlord’s property rights under the police power, giving rise to a substantive ground of defense in unlawful detainer proceedings. The mere fact that a city’s exercise of the police power creates such a defense does not bring it into conflict with the state’s statutoiy scheme. Thus, a landlord’s violations of a city’s housing code may be the basis for the defense of breach of warranty of habitability in a summaiy proceeding instituted by the landlord to recover possession for nonpayment of rent. (Green v. Superior Court, supra, 10 Cal.3d 616, 637-638; Hinson v. Delis, supra, 26 Cal.App.3d 62.) Similarly, the statutoiy remedies for recovery of possession and of unpaid rent (see Code Civ. Proc., §§ 1159-1179a; Civ. Code, § 1951 et seq.)'do not preclude a defense based on municipal rent control legislation enacted pursuant to the police power imposing rent ceilings and limiting the grounds for eviction for the purpose of enforcing those rent ceilings. (Inganamort v. Borough of Fort Lee, supra, 62 N.J. 521, 537; Warren v. City of Philadelphia, supra, 382 Pa. 380, 385.) In addition to limiting the substantive grounds for eviction the charter amendment prescribes procedures that a landlord must undergo as a prerequisite to seeking repossession of a rent-controlled unit. Before commencing unlawful detainer proceedings (Code Civ. Proc., § 1164 et seq.) the landlord is required to obtain a certificate of eviction from the rent control board. (§ 7, subds. (b), (g).) The Board must give notice of the application for the certificate to the tenant or tenants who then have five days in which to request a full hearing conducted under the rules governing hearings for adjustments in maximum rents. (§ 7, subds. (c), (e).) The hearing must be scheduled within seven days after it is requested (§ 7, subd. (d)) and the feoard must grant or deny the certificate within five days after the hearing is held (§ 7, subd. (f)). However, no limit is stated for the time within which the Board must give the tenants notice of the application after it is filed or must act on the application if no hearing is requested following such notice. Moreover, there is an express provision that either party may seek judicial review of a decision of the Board to grant or deny a certificate. (§ 7, subd. (g); § 9.) To be granted a certificate the landlord must carry the burden of showing not only the existence of permissible grounds for eviction and that the tenancy has been properly terminated by notice but also that there are “no outstanding Code violations on the premises” other than those “substantially caused by the present tenants.” (§ 7, subds. (b), (e).) Moreover, the Board is forbidden to issue a certificate if it finds that “the eviction is in retaliation for reporting Code violations or violations of this Article [the charter amendment], or for organizing other tenants, or for enforcing rights under this Charter Amendment.” (§ 7, subd. (e).) A finding adverse to the landlord on the existence of code violations on the premises or on the issues of retaliation precludes issuance of the certificate regardless of the existence of any of the grounds for eviction permitted by subdivision (a) of section 7. As already stated, the charter amendment is invalid to the extent that it purports to regulate a field that is fully occupied by general state law. (Healy v. Industrial Acc. Com. (1953) 41 Cal.2d 118, 122 [258 P.2d 1]; fn. 10, ante.) Plaintiffs urge and the trial court found that to require a landlord to obtain a certificate of eviction before seeking to recover possession of a rent-controlled unit invalidly conflicts with sections 1159 through 1179a of the Code of Civil Procedure, which provide landlords with a summary procedure for exercising their rights of repossession against tenants. We agree. Unlike the limitations imposed by the charter amendment upon chargeable rents and upon the grounds for eviction, which can affect summary repossession proceedings only by making substantive defenses available to the tenant, the requirement of a certificate of eviction raises procedural barriers between the landlord and the judicial proceeding. Thus if a tenant were permitted to raise as a defense in a summary proceeding that the landlord had failed to obtain a certificate of eviction, the terms of the charter amendment would not permit the landlord to meet the defense by showing that he could have qualified for the certificate had he applied for it but would preclude him from relief simply because he had never gone through the proper procedures before the rent control board. The summary repossession procedure (Code Civ. Proc., §§ 1159-1179a) is intended to be a relatively simple and speedy remedy that obviates any need for self-help by landlords. (Kassan v. Stout (1973) 9 Cal.3d 39, 43-44 [106 Cal.Rptr. 783, 507 P.2d 87]; Jordan v. Talbot (1961) 55 Cal.2d 597, 604-605 [12 Cal.Rptr. 488, 361 P.2d 20, 6 A.L.R.3d 161]; see Lindsey v. Normet (1972) 405 U.S. 56, 71-73 [31 L.Ed.2d 36, 49-50, 92 S.Ct. 862].) To require landlords to fulfill the elaborate prerequisites for the issuance of a certificate of eviction by the rent control board before they commence the statutory proceeding would nullify the intended summary nature of the remedy. City charter provisions purporting to impose far less burdensome prerequisites upon the exercise of statutory remedies have been held to be invalid invasions of the field fully occupied by the statute. In Eastlick v. City of Los Angeles, supra, 29 Cal.2d 661, damages for personal injuries resulting from a fall on a broken sidewalk were recovered from the defendant city by a plaintiff who had filed a timely claim in full compliance with the applicable state statute prior to commencing the suit. The city contended that the claim was insufficient as filed because it did not include the more detailed information prescribed by the city charter, arguing “that its charter provision as to itemization of damages is merely supplementary to the general law—an additional, not a contrary requirement—and therefore is valid.” (29 Cal.2d at p. 666.) We held that the statute had occupied the field of filing such claims ¿gainst municipalities and that the city could not impose more onerous conditions with respect to the required contents of a claim. We rejected the city’s contention that its auditing procedures required more detailed information, pointing out that the statute was intended to provide completely for the city’s needs for information about claims in advance of suit. (29 Cal.2d at p. 667.) Similarly in Wilson v. Beville (1957) 47 Cal.2d 852 [306 P.2d 789], we held that an inverse condemnation suit against a city could not be conditioned upon compliance with the claim-filing requirements of the city’s charter. The state statutes fully occupy the field of assessing compensation for condemned property and therefore a city charter cannot make the recoveiy of such compensation more onerous. Thus we conclude that the present charter amendment’s requirement that landlords obtain certificates of eviction before seeking repossession of rent-controlled units cannot stand in the face of state statutes that fully occupy the field of landlord’s possessoiy remedies. Insofar as the charter amendment simply prohibits eviction of tenants who are in good standing except for the expiration of their tenancies, it is a reasonable means of assuring compliance with maximum rent limits and does not conflict with statutoiy repossession proceedings even though making available a substantive defense to eviction. However, we have concluded for reasons to be explained that the charter amendment’s provisions for fixing maximum rents are constitutionally defective. Hence the limitation on the grounds for eviction cannot stand as it has no legislative purpose in the absence of limits on rent. (See F. T. B. Realty Corp. v. Goodman (1949) 300 N.Y. 140, 148 [89 N.E.2d 865].) Although the charter amendment contains a severability clause (§ 12), such a clause does not require that we salvage provisions which even though valid are not intended to be independently operative. (Santa Barbara Sch. Dist. v. Superior Court (1975) 13 Cal.3d 315, 331 [118 Cal.Rptr. 637, 530 P.2d 605].) Regulation of Maximum Residential Rents in Berkeley as an Exercise of the Police Power We have thus far concluded (1) that in the absence of conflicting or preemptive state law the defendant city’s police power within its territorial limits is as broad as the police power exercisable by the Legislature and (2) that general state law does not preclude the defendant city from imposing maximum limits on residential rents within its territory or from restricting the grounds for evicting tenants for the purpose of enforcing those limits insofar as such control of rents and evictions is a proper exercise of the police power. We now consider whether defendant could rightfully exercise its police power in this manner under the circumstances established by the record. Plaintiffs urge and the trial court concluded that rents cannot constitutionally be controlled in the absence of an “emergency” which the trial court defined in the language of Levy Leasing Co. v. Siegel (1922) 258 U.S. 242, 245 [66 L.Ed. 595, 602, 42 S.Ct. 289], as a condition “so grave that it constitute^] a serious menace to the health, morality, comfort, and even to the peace of a large part of the people of the State” (or in this case the city). The Levy Leasing decision and Marcus Brown Co. v. Feldman (1921) 256 U.S. 170 [65 L.Ed. 877, 41 S.Ct. 465], rejected due process objections under the Fourteenth Amendment to New York State statutes enacted in 1920 to deal with a grave housing shortage resulting from the cessation of building activities incident to World War I. The statutes provided in effect that during a period of approximately two years tenants should be immune from eviction if they paid a reasonable rent to be determined by the courts and were not “objectionable” and if the landlord did not seek to repossess the premises for personal use or demolition. Similar congressional legislation for the District of Columbia under which the rental owed by a tenant remained the same unless modified by a rent commission was upheld as against due process objections in Block v. Hirsh, supra, 256 U.S. 135. However, in Chastleton Corp. v. Sinclair (1924) 264 U.S. 543 [68 L.Ed. 841, 44 S.Ct. 405], the court made clear it would not tolerate extension of these rent controls beyond the period of the war emergency. Faced with a challenge to a rent reduction order of the District of Columbia Rent Commission dated August 7, 1922, and effective as of the preceding March 1st, the court remanded the case for determination of whether the emergency justifying the statute still existed on the relevant dates in view of reduced government payrolls and new building activities in the City of Washington. The court stated that the increased cost of living would not in itself justify continuing the statute in effect and added that “if the question were only whether the statute is in force today, upon the facts that we judicially know we should be compelled to say that the law has ceased to operate.” (264 U.S. at pp. 548-549 [68 L.Ed. at p. 844].) These decisions concerning rent controls in Washington, D.C. and the State of New York during the aftermath of World War I are the last in which the United States Supreme Court has specifically considered the extent to which the due process clauses of the Fifth and Fourteenth Amendments allow state legislatures, or bodies exercising equivalent powers, to impose rent controls. However, an examination of the evolution of the court’s views in related fields of price and wage controls will demonstrate that the “emergency” doctrine invoked to uphold rent control measures of more than half a centuiy ago is no longer operative as it was formulated as a special exception to limitations on the police power that have long since ceased to exist. At the time of its rent control decisions in the early twenties a majority of the Supreme Court was of the view that the liberty protected by the due process clause included a freedom of contract which normally precluded either state legislatures or Congress legislating for the District of Columbia from regulating the amounts of prices or wages in businesses “not affected with a public interest.” Legislation invalidated pursuant to this view included attempted uses of the police power to fix minimum wages for women (Adkins v. Children’s Hospital (1923) 261 U.S. 525 [67 L.Ed. 785, 43 S.Ct. 394, 24 A.L.R. 1238]), to require compulsory arbitration of disputes over wages and hours in the food processing, clothing, fuel and transportation industries (Wolff Co. v. Industrial Court (1923) 262 U.S. 522 [67 L.Ed. 1103, 43 S.Ct. 630]), and to limit markups on resold theatre tickets (Tyson & Brother v. Banton (1927) 273 U.S. 418 [71 L.Ed. 718, 47 S.Ct. 426, 58 A.L.R. 1236]) and fees chargeable by employment agencies (Ribnik v. McBride (1928) 277 U.S. 350 [72 L.Ed. 913, 48 S.Ct. 545, 56 A.L.R. 1327]). In these cases the court distinguished its rent control decisions as involving “statutes ... of a temporary character, to tide over grave emergencies.” (Tyson & Brother v. Banton, supra, 273 U.S. at p. 437 [71 L.Ed. at p. 725]; accord, Wolff Co. v. Industrial Court, supra, 262 U.S. at p. 542 [67 L.Ed. at p. 1111]; Adkins v. Children’s Hospital, supra, 261 U.S. at pp. 551-552 [67 L.Ed. at pp. 793-794].) But during the thirties this restrictive view of the police power was completely repudiated. Heralding the court’s change of view was Nebbia v. New York (1934) 291 U.S. 502 [78 L.Ed. 940, 54 S.Ct. 505, 89 A.L.R. 1469], where the court declared: “[T]here can be no doubt that upon proper occasion and by appropriate measures the state may regulate a business in any of its aspects, including the prices to be charged for the products or commodities it sells. [¶] So far as the requirement of due process is concerned, and in the absence of other constitutional restriction, a state is free to adopt whatever economic policy may reasonably be deemed to promote public welfare, and to enforce that policy by legislation adapted to its purpose. The courts are without authority either to declare such policy, or, when it is declared by the legislature, to override it. If the laws passed are seen to have a reasonable relation to a proper legislative purpose, and are neither arbitrary nor discriminatory, the requirements of due process are satisfied, and judicial determination to that effect renders a court functus officio.” (291 U.S. at p. 537 [78 L.Ed. at p. 957].) Many of the prior restrictive decisions were expressly overruled. Upholding a women’s minimum wage statute and overruling Adkins v. Children’s Hospital, supra, 261 U.S. 525, the court pointed out that the Constitution does not speak of freedom of contract but only of liberty subject to due process of law, “and regulation which is reasonable in relation to its subject and is adopted in the interests of the community is due process.” (West Coast Hotel Co. v. Parrish (1937) 300 U.S. 379, 391 [81 L.Ed. 703, 708, 57 S.Ct. 578, 108 A.L.R. 1330].) The sweeping nature of the court’s change of views and its direct relationship to the earlier rent control decisions is perhaps seen most clearly in Olsen v. Nebraska (1941) 313 U.S. 236 [85 L.Ed. 1305, 61 S.Ct. 862, 133 A.L.R. 1500], where a unanimous court upheld a statute regulating employment agency fees and not merely overruled Ribnik v. McBride, supra, 277 U.S. 350, but depicted a flood of its intervening decisions as engulfing and repudiating the philosophy and approach of the Ribnik majority. The repudiated legal standard was described as one by which “the constitutional validity of price-fixing legislation, at least in absence of a so-called emergency, was dependent on whether or not the business in question was ‘affected with a public interest’.’’ (Fn. omitted; italics added.) (313 U.S. at p. 245 [85 L.Ed. at p. 1309].) The Olsen court thus made clear that existence of “a so-called emergency” is no longer a prerequisite to the constitutionality of legislation fixing prices regardless of whether the regulated enterprise is “affected with a public interest.” Notwithstanding this basic change in the United States Supreme Court’s view of the state’s power to regulate prices, the courts of several American jurisdictions have continued to treat the existence of a grave emergency as a constitutional prerequisite to any form of governmental rent control. In some instances the requirement has been held to be satisfied by a legislative declaration of emergency in the rent control statute itself and the absence from the record of any ground for treating the declaration as untrue. (Amsterdam-Manhattan, Inc. v. City Rent & Rehab. Adm’n (1965) 15 N.Y.2d 1014 [260 N.Y.S.2d 23, 207 N.E.2d 616]; Lincoln Bldg. Associates v. Barr (1956) 1 N.Y.2d 413 [153 N.Y.S.2d 633, 135 N.E.2d 801] (office space rent control); Israel v. City Rent & Rehab. Adm’n (S.D.N.Y. 1968) 285 F.Supp. 908; Russell v. Treasurer & Receiver General (1954) 331 Mass. 501, 507 [120 N.E.2d 388].) In other cases the lack of a sufficiently grave emergency has been set forth as a reason for holding rent control legislation invalid. (Kress, Dunlap & Lane, Ltd. v. Downing (3d Cir. 1960) 286 F.2d 212 (reversing summary judgment); id. (D. Virgin Is. 1961) 193 F.Supp. 874 (finding sufficient emergency as to low-rent housing but not as to high-rent housing or commercial property); City of Miami Beach v. Fleetwood Hotel, supra, 261 So.2d 861; Warren v. City of Philadelphia (1956) 387 Pa. 362 [127 A.2d 703].) In none of these cases does the prevailing opinion discuss the continued viability of the emergency requirement in light of the United States Supreme Court’s fundamental change of approach to the constitutionality of price regulation under the due process clause. (But see dissenting opn. in Amsterdam-Manhattan, Inc. v. City Rent & Rehab. Adm’n, supra, 15 N.Y.2d 1014, 1015.) The courts that have considered the implications of this change have concluded that it renders the former emergency requirement obsolete. Thus, the Second Circuit Court of Appeals, in affirming dismissal of a landlord’s action against a rent control official under the Civil Rights Act (42 U.S.C.A. § 1983 [42 U.S.C.S. § 1983]) stated that “we have no doubt that it [the United States Supreme Court] would sustain the validity of rent control today. . . . The time when extraordinarily exigent circumstances were required to justify price control outside the traditional public utility areas passed on the day that Nebbia v. New York, 291 U.S. 502, 539, 54 S.Ct. 505, 78 L.Ed. 940, 89 A.L.R. 1469 (1934), was decided. Whether, as some believe, rent control does not prolong the very condition that gave it birth, is a policy issue not appropriate for judicial concern.” (Eisen v. Eastman (2d Cir. 1969) 421 F.2d 560, 567.) Similarly the New Jersey Supreme Court in sustaining the validity of municipal rent control ordinances recently observed that “rent control is, of course, but one example of the larger and more pervasive phenomenon of governmental regulation of prices under the police power. For constitutional purposes, rent control is indistinguishable from other types of governmental price regulation.” (Hutton Park Gardens v. Town Council (1975) 68 N.J. 543 [350 A.2d 1, 7].) Accordingly the New Jersey court concluded that the United States Supreme Court’s abandonment of the emergency prerequisite for price regulation generally was fully applicable to rent control legislation. (Id. [350 A.2d at pp. 8-10].) The same conclusion was reached by the Maryland Court of Appeals in Westchester West No. 2 Ltd. Part. v. Montgomery County (1975) 276 Md. 448 [348 A.2d 856]. Before the present case California appellate courts have not been called upon to consider the validity of a rent control measure. However, the United States Supreme Court’s previously described enlargement of its view of the scope of the police power to regulate prices and its consequent repudiation of any “emergency” prerequisite for price or rent controls find their parallels in our own decisions. It is now settled California law that legislation regulating prices or otherwise restricting contractual or property rights is within the police power if its operative provisions are reasonably related to the accomplishment of a legitimate governmental purpose (Wilke & Holzheiser, Inc. v. Dept, of Alcoholic Bev. Control (1966) 65 Cal.2d 349, 359 [55 Cal.Rptr. 23, 420 P.2d 735]; Allied Properties v. Dept, of Alcoholic Beverage Control (1959) 53 Cal.2d 141, 146 [346 P.2d 737]; Wholesale T. Dealers v. National etc. Co. (1938) 11 Cal.2d 634, 643 [82 P.2d 3, 118 A.L.R. 486]) and that the existence of an emergency is not a prerequisite to such legislation (Jersey Maid Milk Products Co. v. Brock (1939) 13 Cal.2d 620, 637-638 [91 P.2d 577]; Wholesale T. Dealers v. National etc. Co., supra, 11 Cal.2d at pp. 654-655). Plaintiffs contend that a more pressing necessity is constitutionally required for regulation of rents than for the regulation of prices generally because of the historic preference for real property exemplified by the legal presumption that breach of an agreement to transfer real property cannot be adequately compensated by money damages (Civ. Code, § 3387; Remmers v. Ciciliot (1943) 59 Cal.App.2d 113, 119-120 [138 P.2d 306]). This contention is without merit. Among the foremost examples of proper exercises of the police power are restrictions on the use of real property. (See, e.g., Consolidated Rock Products Co. v. City of Los Angeles (1962) 57 Cal.2d 515 [20 Cal.Rptr. 638, 370 P.2d 342]; Miller v. Board of Public Works (1925) 195 Cal. 477 [234 P. 381, 38 A.L.R. 1479].) Plaintiffs’ contention was fully answered in the earliest of the rent control cases on which they rely, where the court referred to such restrictions on the use of real property as building height limitations and succinctly observed that “if, to answer one need, the legislature may limit height, to answer another it may limit rent.” (Block v. Hirsh, supra, 256 U.S. 135, 156 [65 L.Ed. 865, 871].) The court also stated that to restrict landlords to “a reasonable rent” “goes little if at all farther than the restriction put upon the rights of the owner of money by the more debatable usuiy laws.” (256 U.S. at p. 157 [65 L.Ed. at p. 871].) Moreover, the virtual equivalence under modern conditions between the renting of property for residential purposes and the purchase of consumer goods and services (see Green v. Superior Court, supra, 10 Cal.3d 616, 623, 627) points to our applying the same constitutional standards to the regulation of rents that we apply to the regulation of other consumer prices. “Amici curiae seek to distinguish the Nebbia case from the instant case, and particularly call our attention to the fact that the New York statute was of a temporary duration while the California act is without any limitation as to duration, but they fail to show how this difference in the two statutes does in any way divest the legislature of the power to protect an industry from a perilous condition which is permanent in character. Furthermore, the rule appears to be well established that, ‘Failure by the legislature to limit the operation of the law to a definite term does not render the law invalid so long as the conditions which justify the passage of the law remain.’ (People by Van Schaick v. Title & Mortgage Guarantee Co., 264 N.Y. 69 [190 N.E. 153, 96 A.L.R. 297].)” (Jersey Maid Milk Products Co. v. Brock, supra, 13 Cal.2d at pp. 637-638.) “It is quite significant that the various cases relied upon by appellant in the instant case were cited in the dissenting opinion in the Nebbia case. The rule of the Nebbia case has been since followed. (Bordens Farm Products Co. v. Ten Eyck, 297 U.S. 251 [56 Sup. Ct. 453, 80 L.Ed. 669].) It is true that in these cases the United States Supreme Court emphasized the emergency nature of the legislation. The emergency referred to was in fact part of the background of the statutes. In determining judicial action, however, the character of the situation sought to be remedied rather than its abruptness is the governing factor. As we interpret the Nebbia case and the cases from this court hereafter referred to, in passing upon the validity of such statutes the sole constitutional yardstick by which they should be measured is the necessity for and the reasonableness of the regulation. The question as to whether the statute involves direct or indirect price fixing is a false quantity.” (Wholesale T. Dealers v. National etc. Co., supra, 11 Cal.2d at pp. 654-655.) It is suggested that the existence of a serious public emergency should be constitutionally required for rent controls because they create uncertainty about returns from capital investment in rental housing and thereby discourage construction or improvement of rental units, exacerbate any rental housing shortage, and so adversely affect the community at large. Such considerations go to the wisdom of rent controls and not to their constitutionality. In determining the validity of a legislative measure under the police power our sole concern is with whether the measure reasonably relates to a legitimate governmental purpose and “[w]e must not confuse reasonableness in this context with wisdom.” (Wilke & Holzheiser, Inc. v. Dept. of Alcoholic Bev. Control, supra, 65 Cal.2d 349, 359; accord, Consolidated Rock Products Co. v. City of Los Angeles, supra, 57 Cal.2d 515, 522.) We turn then to the question of whether the imposition of any form of residential rent controls for the purposes stated in the present charter amendment is within defendant’s police power in that it is reasonably related to the accomplishment of an objective for which the power can be exercised. It has long been settled that the power extends to objectives in furtherance of the public peace, safety, morals, health and welfare and “is not a circumscribed prerogative, but is elastic and, in keeping with the growth of knowledge and the belief in the popular mind of the need for its application, capable of expansion to meet existing conditions of modem life.” (Miller v. Board of Public Works, supra, 195 Cal. 477, 485; accord, Consolidated Rock Products Co. v. City of Los Angeles, supra, 57 Cal.2d 515, 521-522.) The charter amendment includes in its stated purposes for imposing rent control the alleviation of the ill effects of the exploitation of a housing shortage by the charging of exorbitant rents to the detriment of the public health and welfare of the city and particularly its underprivileged groups. (§ l.) The amendment thus states on its face the existence of conditions in the city under which residential rent controls are reasonably related to promotion of the public health and welfare and are therefore within the police power. However, the constitutionality of residential rent controls under the police power depends upon the actual existence of a housing shortage and its concomitant ill effects of sufficient seriousness to make rent control a rational curative measure. Although the existence of “constitutional facts” upon which the validity of an enactment depends (see D’Amico v. Board of Medical Examiners (1974) 11 Cal.3d 1, 15 [112 Cal.Rptr. 786, 520 P.2d 10]) is presumed in the absence of any showing to the contrary (In re Petersen (1958) 51 Cal.2d 177, 182 [331 P.2d 24]; Hart v. City of Beverly Hills (1938) 11 Cal.2d 343, 348 [79 P.2d 1080]), their nonexistence can properly be established by proof. (D’Amico v. Board of Medical Examiners (1970) 6 Cal.App.3d 716, 727 [86 Cal.Rptr. 245]; see U.S. v. Carolene Products Co. (1938) 304 U.S. 144, 152 [82 L.Ed. 1234, 1241, 58 S.Ct. 778].) In the present case the trial court received evidence presented by the parties from which it made findings concerning the existence of facts justifying the rent control provisions of the charter amendment and concluded that the emergency conditions that the court deemed constitutionally required for rent control did not exist. As already stated no such emergency was constitutionally required. On this state of the record our task is to review the findings (there being no reporter’s transcript) and to sustain the propriety of rent controls under the police power unless the findings establish a complete absence of even a debatable rational basis for the legislative determination by the Berkeley electorate that rent control is a reasonable means of counteracting harms and dangers to the public health and welfare emanating from a housing shortage. (Hamer v. Town of Ross (1963) 59 Cal.2d 776, 783 [31 Cal.Rptr. 335, 382 P.2d 375]; Lockard v. City of Los Angeles (1949) 33 Cal.2d 453, 461-462 [202 P.2d 38, 7 A.L.R.2d 990].) In reviewing the findings we also look to the trial court’s memorandum opinion as an aid to their interpretation. (Williams v. Puccinelli (1965) 236 Cal.App.2d 512, 516 [46 Cal.Rptr. 285]; 6 Witkin, Cal. Procedure (2d ed. 1971) Appeal, § 231, p. 4221.) Far from dispelling any rational basis for rent control, the findings affirm the existence of housing problems that correspond in kind even if not in degree of gravity with the conditions described in section 1 of the charter amendment (see fn. 28, ante). A clause appearing at the outset of the findings on the “emergency” issue states that “whole segments of Berkeley’s population suffer from a serious housing shortage.” Additional findings indicating serious rental housing problems in Berkeley when the charter amendment was adopted include the following: 1. The City of Berkeley “offers a distinctive and attractive life style, and a superior school system which, because integrated, is desirable to minorities and to young people generally, ... is the site of the original campus of the University of Californ