OPINION OF THE COURT

These are appeals, pursuant to 28 U.S.C. § 1292(b) (1976), from an order granting partial summary judgment, 580 F.Supp. 69, declaring that section 14 of the New Jersey Senior Citizens and Disabled Protected Tenancy Act, 1981 N.J.Laws ch. 226, *289§ 14 (codified at N.J.Stat.Ann. § 2A:18-61.11(d) (West Supp. 1983)) (hereafter the “Tenancy Act”), violates the impairment of contracts and taking clauses of the United States Constitution. The plaintiffs are owners of interests in an apartment complex in Springfield, New Jersey affected by that Act. The defendants are the Commissioner of the New Jersey Department of Community Affairs, the Attorney General of New Jersey, and three tenants in the apartment complex who may be protected by the Tenancy Act.

We hold that the Tenancy Act does not violate the impairment of contracts or taking clause of the United States Constitution. Accordingly, we reverse.

I. Legislative Background

New Jersey regulates its rental housing stock through a comprehensive set of statutes. This discussion begins with an examination of the rental housing legislation in place before 1981 and then moves on to a discussion of the provisions of the Senior Citizens and Disabled Protected Tenancy Act that are in issue here.

A. Prior Legislation

Until 1981, tenants in New Jersey were protected from eviction by provisions of the New Jersey Anti-Eviction Act, 1974 N.J. Laws ch. 49 (codified, as amended by 1975 NJ.Laws ch. 311, at N.J.Stat.Ann. §§ 2A:18-61.1 to 61.12 (West Supp. 1983)). That Act authorized evictions on thirteen prescribed grounds.1 One of these grounds was a conversion by the owner from rental housing to condominium form of ownership. N.J.Stat.Ann. § 2A:18-61.1(k) (West Supp. 1983). Eviction for that purpose, however, required that the owner satisfy several conditions.

An owner converting to condominium ownership must have served a notice of termination three years before the institution of any action for eviction. No action could be instituted until the existing lease expired. N.J.Stat.Ann. § 2A:18-61.2(g) (West Supp. 1983). Thus, the Act essentially contained a three-year minimum grace period before eviction. Tenants receiving a three-year notice could, during the eighteen months following its receipt, request that the owner offer to the tenant “the rental of *290comparable housing....” NJ.Stat.Ann. § 2A:18-61.11(a) (West Supp. 1983). Unless the owner located and offered comparable housing, New Jersey courts having jurisdiction over eviction actions were authorized to issue up to five one-year stays of eviction. Id. In practice, therefore, if the owner could not locate comparable housing for the tenant, the grace period before eviction could be extended from three to eight years. After the first stay of eviction, however, the owner could prevent further stays by paying to the tenant a “hardship relocation compensation” equal to five months’ rent. N.J.Stat.Ann. § 2A: 18-61.11(c) (West Supp. 1983). Therefore, after the fourth year following a termination notice — three years plus one stay — owners who could not locate comparable housing were faced with a choice: either they could make a payment to the tenant equal to five months’ rent, and thereby prevent additional stays of eviction; or they could make no such payment and continue receiving rent from the tenant for up to four more years.

In addition to the Anti-Eviction Act, several New Jersey statutes governed the conversion of real property to the condominium form of ownership. The New Jersey Condominium Act, 1969 N.J.Laws ch. 257 (codified at NJ.Stat.Ann. §§ 46:8B-1 to 30 (West Supp. 1983)), provided for conversion of real property to the condominium form by the filing of a master deed meeting certain statutory requirements. N.J.Stat. Ann. § 46:8B-8 (West Supp. 1983). When such a master deed is filed, each unit becomes a separate interest in real property. NJ.Stat.Ann. § 46:8B-4 (West Supp. 1983). New Jersey also authorized the sale by condominium developers of units created by the filing of a master deed. See The Planned Real Estate Development Full Disclosure Act, 1977 N.J.Laws ch. 419 (codified at NJ.Stat.Ann. §§ 45:22A-21 to 42 (West Supp. 1983)). The Disclosure Act required that a public offering statement be filed with the New Jersey Department of Community Affairs. NJ.Stat.Ann. § 45:22A-28 (West Supp. 1983). The Act also authorized the Community Affairs Department to investigate a developer’s application, and to register that application upon finding that the developer is likely to comply with the terms of the public offering statement. NJ.Stat.Ann. §§ 45:22A-29-30 (West Supp. 1983). The developer’s right to offer units for sale to the public was qualified, however, by a provision of the Anti-Eviction Act requiring that tenants must be afforded notice of their option to purchase the units they occupy. N.J.Stat.Ann. § 2AJ8-61.8 (West Supp. 1983).

B. The Tenancy Act

On July 27,1981, the New Jersey Legislature enacted the Tenancy Act. The Act’s purpose is to enhance the protection of certain senior citizens and disabled persons against evictions resulting from condominium conversions. Legislative findings in the Act recite that the “forced eviction and relocation of elderly persons from their established homes and communities harm the mental and physical health of these senior citizens, ... affect adversely the social, economic and cultural characteristics of communities of the State, and increase the costs borne by all State citizens ....”2 Al*291though these appeals concern challenges only to Section 14 of the Tenancy Act, various provisions of the Act are interrelated. These provisions fall into three categories: those sections creating a “protected tenancy period”; a section governing rent increases during that period; and a retroac-tivity section.

1 Protected Tenancy Period

At the heart of the Tenancy Act is a provision in section 4 granting a “protected tenancy status” to “eligible” senior citizens and disabled tenants.3 Section 3 provides that an eligible “senior citizen tenant” is a tenant in a complex of five or more units who was at least 62 years of age on the date of recordation of the master condominium deed, and who occupied a unit as a principal residence for the prior two years, or who is the surviving spouse of such a tenant. NJ.Stat.Ann. § 2A:18-61.24(a), (f) (West Supp. 1983). A recent amendment to this section now provides that an eligible surviving spouse must be at least 50 years of age at the time of the condominium conversion. 1983 N.J.Laws ch. 389 (approved Dec. 2, 1983). An eligible “disabled tenant” is a tenant who, on the date of the conversion, was “totally and permanently unable to engage in any substantial gainful activity by reason of any medically determinable physical or mental impairment, including blindness .... ” N.J.Stat.Ann. § 2A:18-61.24(b) (West Supp. 1983).

Eligible tenants may apply under section 7 to an administrative agency for “protected tenancy status” on or before the date of registration of conversion. These tenants qualify for protected tenancy status if their annual household income does not exceed three times the county per capita personal income level. N.J.Stat.Ann. § 2A:18-61.-28(c) (West Supp. 1983). The “protected tenancy period” conferred by the Act on qualified tenants continues for forty years after the date of conversion. N.J.Stat.Ann. § 2A:18-61.24(h) (West Supp. 1983). No action for eviction may be brought against protected tenants during this period. N J. StatAnn. § 2A:18-61.1(k) (West Supp. 1983). Thus, the effect of qualifying for a protected tenancy is to obtain the right to remain as a tenant in a converted unit for up to forty years beyond any period already authorized by the Anti-Eviction Act. A protected tenancy status may also be terminated. Section 11 of the Act provides that protected status shall be terminated if the unit is no longer the principal residence of the protected tenant, or if the annual household income of the protected tenant exceeds three times the most recently reported county per capita personal income *292level. N.J.Stat.Ann. § 2A:18-61.32 (West Supp. 1983).

2. Rent Increases During Protected Tenancy

The Tenancy Act also governs the magnitude of rent increases that developers may charge in order to recoup condominium conversion costs. Section 10 of the Act provides that in a municipality without a rent control ordinance in effect, the owner cannot use increased costs due to conversion as a justification for the conscionability of a rent increase in a suit for nonpayment of rent.4 N.J.Stat.Ann. § 2A:28-61.31 (West Supp. 1983). In municipalities with rent control ordinances in effect, the impact of the Tenancy Act is slightly different. In these communities, increased costs due to conversion cannot be used to justify a rent increase in a “fair return or hardship hearing” before a municipal rent board. Id. The Township of Springfield, New Jersey has such a rent control ordinance. That ordinance currently authorizes rent increases of six and one-half percent per year, subject to a number of adjustments. Two such adjustments authorize increases in “Rate of Return” and “hardship” hearings; 5 in these hearings, evidence of increased costs due to conversion would evidently not be permitted. Other adjustments — for example, adjustments reflecting increased property taxes — operate automatically, without hearings; these adjustments would apparently permit the passing on of certain conversion costs.6

In sum, the applicable rules in Springfield Township permit a condominium owner to receive yearly rent increases of six and one-half percent from each tenant-occupied condominium during the duration of a protected tenancy, and appear to permit the pass-on of certain condominium conversion costs.

3. The Retroactivity Clause

Section 14 of the Tenancy Act permits the retroactive application of the Act in certain circumstances. That section provides that in any action for a stay of eviction, for declaratory judgment, or in any other proceeding under the Anti-Eviction Act:

the court may invoke some or all of the provisions of the [Tenancy Act] and grant to a tenant, pursuant to that [Act], a protected tenancy period upon the court’s determination that:

(1) The tenant would otherwise qualify as a senior citizen tenant or disabled tenant ... except that the building or structure in which the dwelling unit is located was converted prior to the effective date of that [Act]; and

*293(2) The granting of the protected tenancy period as applied to the tenant, giving particular consideration to whether a unit was sold on or before the date that the [Act] takes effect to a bona fide individual purchaser who intended personally to occupy the unit, would not be violative of concepts of fundamental fairness or due process.

NJ.Stat.Ann. § 2A:18-61.11(d) (West Supp. 1983) (emphasis added). The effect of section 14 is to confer upon the New Jersey courts discretionary authority to recognize a protected tenancy status for certain senior citizens, their spouses, and certain disabled persons who could otherwise have been evicted under the Anti-Eviction Act on three years’ notice plus the tender of comparable rental housing or hardship relocation compensation.

If a court declines to grant protected tenancy status, it may nonetheless authorize up to five one-year stays of eviction until comparable rental housing is provided. The owner does not, however, have the option to buy out the interest of the tenant with a “hardship relocation compensation” of five months’ rent. Id.

II. Facts and Proceedings in the District Court

Troy Hills of Springfield is a garden apartment complex consisting of 342 residential units. Troy, Ltd. (“Troy”) purchased the complex on October 1, 1979. At that time, the complex was occupied by rental tenants. On January 31, 1980, Troy contracted to sell the complex to East Coast Condo Tech, Inc. (“East Coast”), and to take back mortgages on the individual units that would be created by a condominium conversion. On February 28, 1980, Troy filed a master condominium deed, converting its ownership from a single fee to a number of condominium units. East Coast then filed a prospectus with the Department of Community Affairs, which the Department approved, pursuant to the Planned Real Estate Full Disclosure Act, in October of 1980. In January of 1981, East Coast served the three-year notices of eviction required by the Anti-Eviction Act on all tenants in the complex. The Troy-to-East-Coast closing took place on June 28, 1981, one month before the effective date of the Tenancy Act. East Coast became the owner of the separate units; Troy became the mortgagee of those units.

Many units were sold pursuant to the approved prospectus. Among the purchasers of these units are the four individual plaintiffs in this action, John F. King, Jr., Milton Snyder, Morton Weinberg, and Stephen Forman. Weinberg and Forman executed sales contracts for condominiums before the effective date of the Tenancy Act, but closed these sales after its effective date. King and Snyder both executed sales contracts and closed sales after the Act’s effective date.

On November 6, 1981, Troy and East Coast filed this action seeking declaratory and injunctive relief against the enforcement of the Tenancy Act. The complaint named as defendants the New Jersey Community Affairs Commissioner and the Attorney General (the “state defendants”) and three tenants who were alleged to claim benefits under the Act as senior citizens (the “tenant defendants”). Counts I and II challenged the rent-control and protected-tenancy provisions of the Act in their prospective application. Count III of the complaint attacked the retroactive operation of section 14. That count averred that section 14 constitutes an impairment of contract, and a taking of property without just compensation, in a variety of respects, principally by aborting the sale of condominium units occupied by tenants who qualify for a protected status, and by denying to the owners of these units “the recovery of the costs of operation and a fair return upon the value of the units.” Compl. 132, App. at 31-32. Count III also alleged a diminution in the value of the complex as security for any mortgage, and an impairment of the ability to obtain further financing on these units. Id.

At the time plaintiffs filed this complaint, the tenant-defendants had not obtained court orders declaring that they *294qualified for protected tenancy status. Arguing that the district court should not proceed without such a determination, the tenant-defendants filed a motion for abstention on April 10, 1982. The district court denied that motion on April 26. On May 25, Troy and East Coast moved to add the four individual investor-plaintiffs— King, Snyder, Weinberg, and Forman — and moved for partial summary judgment on due process, equal protection, and taking grounds. The state-defendants cross-moved for summary judgment on July 6. The tenant-defendants also filed a cross-motion for summary judgment seeking to dismiss the complaint “insofar as it alleges that [section 14] is unconstitutional.”

On December 13, 1982, the district court entered partial summary judgment on that portion of the complaint alleging that the retroactive operation of section 14 violated the impairment of contract and taking clauses. Reasoning that the alterations authorized by the Act “amount to a serious disruption of the grantee’s expectations,” the district court held that section 14 violated the impairment of contract clause, as interpreted in United States Trust Co. v. New Jersey, 431 U.S. 1, 97 S.Ct. 1505, 52 L.Ed.2d 92 (1977). The court also held that because section 14 applied to premises already converted, it violated the federal constitutional prohibition against uncompensated takings, as interpreted in Loretto v. Teleprompter Manhattan CATV Corp., 458 U.S. 419, 102 S.Ct. 3164, 73 L.Ed.2d 868 (1982).

The district court’s order certified that it involves a controlling question of law as to which there is substantial ground for difference of opinion, and that an immediate appeal from it may materially advance the ultimate termination of the litigation. On January 10, 1983, we granted leave to appeal under 28 U.S.C. 1292(b) (1976). We now reverse.

III. Impairment of Contract

Article I, section 10 of the United States Constitution prohibits the states from passing a “Law impairing the Obligation of Contracts.” Historically, the Supreme Court has analyzed quite differently the operation of that clause on contracts between private parties and states, on the one hand, and on contracts among private parties on the other. The district court’s reliance on United States Trust Co. v. New Jersey, 431 U.S. 1, 97 S.Ct. 1505, 52 L.Ed.2d 92 (1977), requires that we examine this longstanding distinction.

A.

The contract clause is among those provisions of the Constitution addressing post-Revolutionary War state legislation purporting to repudiate obligations owed by local debtors to British and loyalist creditors. A number of states had,, in evident violation of article IV of the 1783 Treaty of Peace, 8 Stat. 80, 82, enacted laws staying the time for payment of debts, making paper money legal tender, and sequestering debts due British creditors. See Home Building & Loan Ass’n v. Blaisdell, 290 U.S. 398, 454-61, 54 S.Ct. 231, 246-48, 78 L.Ed. 413 (1934) (Sutherland, J., dissenting); Sturges v. Crowninshield, 17 U.S. (4 Wheat.) 122, 204, 4 L.Ed. 529 (1819). Thus, article I, section 10 of the Constitution forbade the states from coining money, emitting bills of credit, making anything but gold and silver coin a tender for the payment of a debt, and “impairing the Obligation of Contracts.” U.S. Const, art. I, § 10, cl. 1.

Although the contract clause arose from the purported repudiation of contracts between private parties, the Supreme Court held in 1810 that the clause prohibited a state’s repudiation of its own contracts as well. Fletcher v. Peck, 10 U.S. (6 Cranch) 87, 137-39, 3 L.Ed. 162 (1810). Fidelity to the principle that “one legislature cannot abridge the powers of a succeeding legislature,” id. at 134, 3 L.Ed. 162, soon, however, led to a relaxation of the rigor with which the Court scrutinized legislation decreasing the value of public contracts. See, e.g., Charles River Bridge v. Warren Bridge, 36 U.S. (11 Pet.) 420, 432, 9 L.Ed. 773 (1837) (charter to operate a bridge subject to legis*295lative power to charter a competitor); Stone v. Mississippi, 101 U.S. 814, 817-20, 25 L.Ed. 1079 (1880) (state-chartered lottery company rendered valueless by subsequent abolition of lotteries); Fertilizing Co. v. Hyde Park, 97 U.S. 659, 667-70, 24 L.Ed. 1036 (1878) (value of state-chartered fertilizer company impaired by ordinance prohibiting transportation of fertilizer).

In contrast, laws alleged to impair the obligations of contracts between private parties were for many years scrutinized far more rigorously. These cases arose principally out of state efforts to provide relief for impecunious debtors. The Court consistently held that any state law retroactively modifying the obligations of debtors violated article I, section 10. See, e.g., Ogden v. Saunders, 25 U.S. (12 Wheat.) 212, 261-70, 6 L.Ed. 606 (1827) (Washington, J.); id. at 295 (Thompson, J.); id. at 326-27 (Trimble, J.); Green v. Biddle, 21 U.S. (8 Wheat.) 1, 84-85, 5 L.Ed. 547 (1823) (“[a]ny deviation from its terms . .. however minute, or apparently immaterial ... impairs its obligation”); Sturges v. Crowninshield, 17 U.S. (4 Wheat.) 122, 207, 4 L.Ed. 529 (1819). The Court’s doctrine that changes in the law of remedies could amount to an impairment of private contractual obligations placed fairly tight limits on the authority of states to grant relief to debtors by the manipulation of state remedial laws. See, e.g., Green v. Biddle, 21 U.S. (8 Wheat.) at 83-85, 5 L.Ed. 547 (lien on land for value of improvements impairs obligation of contract). In this sense, the Supreme Court treated the impairment of contract clause as the obverse of the grant of congressional authority in article I, section 8 of the Constitution to establish uniform laws on the subject of bankruptcies. U.S. Const, art. I, § 8, cl. 4. Congress could, but the states could not, impair the obligation of undertakings by debtors. See Hanover National Bank v. Moyses, 186 U.S. 181, 188, 22 S.Ct. 857, 860, 46 L.Ed. 1113 (1902) (“The [Bankruptcy] grant to Congress involves the power to impair the obligation of contracts, and this the States were forbidden to do.”).

In 1934 the Supreme Court took a historic step toward inverting the longstanding dichotomy between public and private contracts. In the significant case of Home Building & Loan Ass’n v. Blaisdell, 290 U.S. 398, 54 S.Ct. 231, 78 L.Ed. 413 (1934), the Court held that the contract clause should not be read as a serious impediment to state social and economic legislation affecting private contracts. Blaisdell examined a Minnesota mortgage moratorium law, enacted as an emergency measure during the great Depression, which extended the redemption period for mortgages. In sustaining the extended redemption period, the Court held for the first time that legislation retroactively affecting the value of an underlying contractual obligation did not violate the contract clause when enacted in pursuit of legitimate economic or social objectives. “The economic interests of the State,” the Court held,

may justify the exercise of its continuing and dominant protective power notwithstanding interference with contracts.... The question is not whether legislation affects contracts incidentally, or directly or indirectly, but whether the legislation is addressed to a legitimate end and the measures taken are reasonable and appropriate to the end.

290 U.S. at 437-38, 54 S.Ct. at 239-40. The Court characterized the power of economic and social legislation to affect private contractual arrangements as the “reserved power,”7 and noted that the states’ reserved police powers and the contract clause must be construed in harmony with one another:

This principle precludes a construction which would permit the State to adopt as its policy the repudiation of debts or the destruction of contracts or the denial of means to enforce them. But it does not *296follow that conditions may not arise in which a temporary restraint of enforcement may be consistent with the spirit and purpose of the constitutional provision and thus be found to be within the range of the reserved power of the State to protect the vital interests of the community.

Id. at 439, 54 S.Ct. at 240. In subsequent cases, the Court enlarged the degree of deference accorded to state economic and social legislation affecting private contract rights. Eg., Veix v. Sixth Ward Building & Loan Ass’n, 310 U.S. 32, 37-39, 60 S.Ct. 792, 79A-795, 84 L.Ed. 1061 (1940) (sustaining permanent legislation limiting withdrawal of funds from savings and loan associations); East New York Savings Bank v. Hahn, 326 U.S. 230, 233-35, 66 S.Ct. 69, 70-71, 90 L.Ed. 34 (1945) (approving tenth extension of mortgage moratorium). Under these post-Blaisdell authorities, the contract clause placed only limited inhibitions on the ability of state legislatures to address significant social problems by legislation affecting existing contractual undertakings between private parties.

In 1977, the Court completed the inversion begun in Blaisdell of its analyses of public and private contracts. In United States Trust Co. v. New Jersey, 431 U.S. 1, 97 S.Ct. 1505, 52 L.Ed.2d 92 (1977), the Supreme Court struck down state legislation repealing a covenant between the state of New Jersey and its bondholders pledging to limit mass transit deficits to a percentage of cash reserves and revenues of the transit authority. United States Trust was thus one of the long line of cases stretching back to Fletcher v. Peck, 10 U.S. (6 Cranch) 87, 3 L.Ed. 162 (1810), addressing efforts by the states to repudiate by subsequent .legislation their own contractual undertakings. Despite early deference to such legislation, the Supreme Court in United States Trust applied a higher standard of scrutiny to state abrogations of their own contractual arrangements than to state efforts to modify purely private agreements. The Court reasoned that when the state is a party to the contract, “complete deference to a legislative assessment of reasonableness and necessity is not appropriate because the State’s self-interest is at stake.” 431 U.S. at 26, 97 S.Ct. at 1519. In these cases, the Court held, it would apply a more exacting standard of scrutiny, examining whether “a less drastic modification would have” sufficed and whether the modification was reasonable in light of changed circumstances. Id. at 30-32, 97 S.Ct. at 1521-1522.

It is evident, therefore, that the district court erred in relying on United States Trust Co. v. New Jersey. That case is one of many from age to age dealing with the abrogation of contractual terms between a state and private parties. The higher standard of United States Trust is not relevant to the disposition of this case, which poses the very different problem of legislation allegedly impairing the obligation of contracts between private parties. The appropriate line of authority for this issue is that of Home Building & loan Ass’n v. Blaisdell and its progeny, and it is to that line of cases that we now turn.

B.

The most recent authority in the line of cases addressing state legislation affecting private contracts is the Supreme Court’s decision last term in Energy Reserves Group, Inc. v. Kansas Power and Light Co., -- U.S. --, 103 S.Ct. 697, 74 L.Ed.2d 569 (1983). In Energy Reserves, the Court considered an impairment-of-contracts challenge to a Kansas statute imposing price ceilings on newly discovered gas. These price ceilings were lower than those which would otherwise have been charged under a long-term supply contract. Justice Black-mun’s opinion for a unanimous Court is significant in several respects. First, the Court reiterated the distinction, noted above, between the level of scrutiny applicable under United States Trust Co. to impairments when the state itself is a contracting party, and the level of scrutiny applied to other economic and social legislation. 103 S.Ct. at 705-06 & n. 14. Second, the Court drew the analyses of its prior cases into a three-step investigation.

*297The threshold inquiry is whether the state law has operated “ ‘as a substantial impairment of a contractual relationship.’ ” Id. at 704-05, quoting Allied Structural Steel Co. v. Spannaus, 438 U.S. 234, 244, 98 5. Ct. 2716, 2722, 57 L.Ed.2d 727 (1978).8 If the state law is found to be a “substantial impairment,” then a second inquiry is required: “the State, in justification, must have a significant and legitimate public purpose behind the regulation ... such as the remedying of a broad and general social or economic problem.” Id. 103 S.Ct. at 705. Finally, if such a legitimate public purpose is identified, a third query is posed: “the next inquiry is whether the adjustment of ‘the rights and responsibilities of contracting parties [is based] upon reasonable conditions and [is] of a character appropriate to the public purpose justifying [the legislation’s] adoption.’ ” Id., quoting United States Trust Co., 431 U.S. at 22, 97 S.Ct. at 1517. It is at this third stage that the distinction introduced in United States Trust enters:

Unless the State itself is a contracting party, ... “[a]s is customary in reviewing economic and social regulation, ... courts properly defer to legislative judgment as to the necessity and reasonableness of a particular measure.”

Energy Reserves Group, 103 S.Ct. at 705-06, quoting United States Trust Co., 431 U.S. at 22-23, 97 S.Ct. at 1517-1518.

1. Substantiality of the Impairment

We have no doubt that the 1981 Tenancy Act passes muster under the contract clause as interpreted in Energy Reserves Group. First, it is doubtful that any impairment of a contractual relationship has occurred. The Tenancy Act only enlarged, for senior citizens and the disabled, a preexisting statutory tenancy which came into operation as a matter of law. Prior to the enactment of the Tenancy Act, New Jersey had already placed significant limitations upon the rights of owners of multiple dwellings to define the landlord-tenant relationship solely in terms of contract. The 1974 Anti-Eviction Act, which is not here challenged, provided that tenants could not be evicted; except for designated causes not relevant here, during the contractual term of a lease. See note 1 supra. Moreover, the Act mandated an eight-year extension of the lease — or a four-year extension coupled with a “hardship compensation payment” — if the landlord did not offer the tenant comparable housing. N.J. Stat.Ann. § 2A:18-61.2(g) (West Supp. 1983). Thus, beginning in 1974 the terms of the landlord-tenant relationship were specified to a large extent by statute. The Tenancy Act only operates to protect those statutory tenants whose relationship with their landlord has already become non-consensual by virtue of the Anti-Eviction Act. That is, the Tenancy Act simply enlarges the terms of a statutory tenancy already created by the Anti-Eviction Act. All of the plaintiffs acquired their interests in the Springfield complex after the Anti-Eviction Act went into effect. Such an enlargement of an already-regulated statutory tenancy is probably not an impairment at all. As the Supreme Court held in Veix v. Sixth Ward Building & Loan Ass’n, 310 U.S. 32, 38, 60 S.Ct. 792, 794, 84 L.Ed. 1061 (1940), “[w]hen he purchased into an enterprise already regulated in the particular to which he now objects, he purchased subject to further legislation upon the same topic.”

Even if that statutory tenancy is deemed to fall within the coverage of the impairment clause, however, we have no doubt that its extension, beyond the eight years already provided in the Anti-Eviction Act, is not “substantial.” Most eligible tenants *298are by definition 62 years of age at the date of the conversion (or, if surviving spouses, 50 years of age). These tenants would be 70 years of age (or, if surviving spouses, 58 years of age) at the conclusion of the eight-year Anti-Eviction period. During any addition to this period, the owner is entitled to rent increases authorized under local law, here six and one-half percent per year. The owner may still evict for the other reasons enumerated in note 1, supra. The extended tenancy ends if the tenant ceases to make the unit the principal residence. Under these conditions, if the Act constitutes an impairment at all, it is not a “substantial” one.9

2. Legitimacy and Reasonableness of Public Purpose

Assuming, however, that the plaintiffs had actually satisfied the Energy Reserves threshold requirement by showing a substantial impairment, there is no question but that the state has justified it by showing a broad remedial purpose in protecting the mental and physical health of citizens who could suffer greatly by evictions. The legislative findings expressly report that the relocation of elderly and disabled persons is disruptive, costly for themselves and for the state in general, and particularly injurious for these persons who are often limited to fixed incomes. N.J.Stat.Ann. § 2A:18-61.23 (West Supp. 1983); see note 2 supra.

In assessing the reasonableness of these purposes, we are admonished not to substitute our views for those of the legislature. Because the state is not itself a contracting party, in this sphere of economic and social regulation we “properly defer to legislative judgment as to the necessity and reasonableness of” the Act. Energy Reserves Group, 103 S.Ct. at 706. Moreover, here the availability of a protected tenancy depends upon a reasonable personal income test, N.J.Stat.Ann. § 2A:18-61.28(c) (West Supp. 1983), and is in any event subject to the exercise of discretion by the New Jersey Courts. Those Courts are directed to consider “fundamental fairness” in deciding to confer “some or all” of the Act’s protections to eligible tenants. In light of these considerations, the 1981 Tenancy Act amply satisfies the requirement of a legitimate and reasonable public purpose.

C.

Finally, the plaintiffs rely on Allied Structural Steel Co. v. Spannaus, 438 U.S. 234, 98 S.Ct. 2716, 57 L.Ed.2d 727 (1978), urging that Allied represents a significant reinterpretation of the impairment clause. In Allied, the Court examined a Minnesota pension law requiring corporations that closed their offices in Minnesota, and nowhere else, to purchase annuities for former employees whose pensions had not yet vested under a company pension plan. Holding that the Act’s retroactive application violated the contract clause, Justice Stewart wrote for the Court:

Entering a field it had never before sought to regulate, the Minnesota Legislature grossly distorted the company’s existing contractual relationships with its employees by superimposing retroactive obligations upon the company substantially beyond the terms of its employment contracts. And that burden was imposed upon the company only because it closed its office in the State.

This Minnesota law simply does not possess the attributes of those state laws that in the past have survived challenge under the Contract Clause of the Constitution. The law was not even purportedly enacted to deal with a broad, generalized economic or social problem.... It did not operate in an area already subject to state regulation at the time the company’s contractual obligations were origi*299nally undertaken, but involved an area never before subject to regulation by the State.... It did not effect simply á temporary alteration of the contractual relationships of those within its coverage, but worked a severe, permanent, and immediate change in those relationships — irrevocably and retroactively.... And its narrow aim was leveled, not at every Minnesota employer, not even at every Minnesota employer who left the State, but only at those who had in the past been sufficiently enlightened as voluntarily to agree to establish pension plans for their employees.

438 U.S. at 249-50, 98 S.Ct. at 2724-25 (citations omitted).

Justice Stewart’s language in Spannaus evidently evinces less deference to state economic policy decisions affecting private contracts than do the opinions which intervened between Spannaus and Blaisdell. Nevertheless, we do not believe the Span-naus ease furthers the plaintiffs’ cause. The Spannaus Court relied upon a combination of circumstances not presented by the Tenancy Act. Spannaus deals with the modification of an existing contractual relationship voluntarily arrived at by negotiation between employer and employee. The Tenancy Act, in contrast, involves the modification of the terms of a non-contractual statutory tenancy previously imposed by state law. In Spannaus, the Minnesota legislature entered a field it had never before sought to regulate; New Jersey, to the contrary, regulated statutory tenancies following the expiration of a contractual lease beginning in 1974, and the plaintiffs purchased subject to those limitations. The Minnesota legislation, as described by Justice Stewart, did not address a broad generalized social problem. Indeed, there were indications that the legislation intended to single out “a small number of employers ... from the larger group.” Energy Reserve Group, 103 S.Ct. at 708 n. 25. Here the legislative findings and affidavits on file establish that New Jersey — both in the 1974 Anti-Eviction Act and in the 1981 Tenancy Act — dealt with a generalized, extremely serious housing shortage caused by the unavailability of mortgage funds, which placed great economic pressure on owners of rental property to capitalize on that shortage by converting to condominium ownership. Finally, Minnesota singled out the pension contract obligations of employers leaving that state. New Jersey, on the other hand, excluded from the coverage of the Anti-Eviction Act and the Tenancy Act only multiple dwellings with fewer than five units. The Act thereby “imposed a generally applicable rule of conduct designed to advance a broad societal interest.” Exxon Corp. v. Eagerton, -- U.S. --, 103 S.Ct. 2296, 2306, 76 L.Ed.2d 497 (1983).

For these reasons, we do not agree that the 1981 Senior Citizens and Disabled Protected Tenancy Act constitutes an impairment of the obligation of contract. Thus, the summary judgment holding section 14 unconstitutional, insofar as it rested on article I, section 10, cannot stand.

IV. The Taking Clause

It has long been settled that “ ‘since the adoption of the Fourteenth Amendment compensation for private property taken for public uses constitutes an essential element in ‘due process of law,’ and that without such compensation the appropriation of private property to public uses, no matter under what form of procedure it is taken, would violate the provisions of the Federal Constitution.’ ” Chicago, B. & Q.R.R. v. Chicago, 166 U.S. 226, 239, 17 S.Ct. 581, 585, 41 L.Ed. 979 (1897), quoting Scott v. City of Toledo, 36 F. 385, 396 (C.C.N.D.Ohio 1888). It has also been long settled that not every governmental regulation of the uses to which private property may be put is a taking for public use. See Miller v. Schoene, 276 U.S. 272, 277-80, 48 S.Ct. 246, 72 L.Ed. 568 (1928) (statute authorizing destruction of diseased cedar trees); Village of Euclid v. Ambler Realty Co., 272 U.S. 365, 386-95, 47 S.Ct. 114, 117-21, 71 L.Ed. 303 (1926) (industrial zoning regulation).10 *300The line between permissible police power regulations and impermissible uncompensated takings for public use has not always been easy to discern. In three recent decisions, the Court rejected challenges alleging takings without just compensation. See Agins v. City of Tiburon, 447 U.S. 255, 260-63, 100 S.Ct. 2138, 2141-42, 65 L.Ed.2d 106 (1980), Penn Central Transp. Co. v. New York City, 438 U.S. 104, 122-38, 98 S.Ct. 2646, 2658-66, 57 L.Ed.2d 631 (1978); Goldblatt v. Town of Hempstead, 369 U.S. 590, 592-94, 82 S.Ct. 987, 989-90, 8 L.Ed.2d 130 (1962). In Loretto v. Teleprompter Manhattan C.A.T.V. Corp., 458 U.S. 419, 425-41, 102 S.Ct. 3164, 3170-79, 73 L.Ed.2d 868 (1982), in contrast, the Court sustained such a challenge. The district court concluded that Loretto, rather than Agins, Penn Central and Goldblatt, controlled. We disagree.

A.

The difficulty which sometimes arises in determining when an uncompensated-taking analysis is appropriate arises out of the failure of courts and litigants to recognize that there is no federal constitutional prohibition against takings, as such. Rather, the Constitution proscribes takings for public use “without just compensation.” If adequate compensation is afforded, and if the challenged legislation has a sufficient public purpose to satisfy the demands of equal protection and substantive due process, then it is valid despite the fact that it may change the incidents of ownership in, or even the possession of, private property. See O’Neill v. Learner, 239 U.S. 244, 248, 251-54, 36 S.Ct. 54, 56, 57-58, 60 L.Ed. 249 (1915) (adequate compensation scheme available; challenge rejected on substantive due process grounds).

Thus, the fact that the Tenancy Act creates a statutory tenancy for senior citizens and disabled persons that may amount to a “taking” could not, alone, be dispositive of its constitutionality. Both the Anti-Eviction Act and the Tenancy Act provide for compensation to the owner in the form of rent.11 Until the district court analyzes the compensation features of the statutory scheme to determine whether the level of compensation is adequate, it cannot find an uncompensated taking. No such analysis was made in this case. Indeed, on the summary judgment record on which the court acted, none could be made.

The Supreme Court’s recent holding in Loretto v. Teleprompter Manhattan CATV Corp., 458 U.S. 419, 102 S.Ct. 3164, 73 L.Ed.2d 868 (1982), does not compel a different conclusion. Loretto addressed the constitutionality of a New York statute requiring owners of rental properties to permit the installation of facilities for cable television transmission owned by cable franchise holders. In that case, the New York Court of Appeals had held that no taking had occurred and had entered judgment for the defendants. The Supreme Court reversed, but remanded for a determination of the question whether the amount of compensation to the owner provided under the New York statutory scheme was adequate. Id. at 441, 102 S.Ct. at 3179. Thus, Loretto does not stand for the proposition that an uncompensated-taking challenge to a statute providing for some form of compensation may be decided, in favor of the party challenging the stat*301ute, facially without a record. It is clear from the remand in Loretto that if the compensation owed by cable franchisees to the owners proved to be adequate, then the New York statute would be constitutional. Plainly, therefore, the summary judgment that section 14 of the Tenancy Act is facially unconstitutional cannot stand.

B.

The appellants also urge that the order appealed from must be reversed because, apart from the absence of findings on “just compensation,” the Tenancy Act does not entail a “taking for public use.” Instead, they maintain, the Act is a classic economic or social regulation falling outside the ambit of the prohibition against uncompensated takings for public uses. Because this issue may obviate the necessity to determine the factual question of whether the provision for payment of rent amounts to just compensation, the issue is “a controlling question of law” which “may materially advance the ultimate termination of the litigation.” 28 U.S.C. § 1292(b) (1976). That being the case, we reach it.

In Loretto, the Supreme Court held that a “permanent physical occupation of property is a taking.” 458 U.S. at 441, 102 S.Ct. at 3179. The Tenancy Act is clearly not a taking of property under the Loretto standard of permanency. Most tenants with a protected status will be 70 years of age (or, if surviving spouses, 58 years of age) before the Tenancy Act comes into play. It is fanciful to imagine that these tenants will occupy their units “permanently.” Moreover, the tenancies may terminate by virtue of changing income levels or principal residences, and tenants may be evicted on any of thirteen grounds. See note 1 supra. Finally, the Loretto Court itself distinguished state housing legislation authorizing an extension of the tenant’s lease. 458 U.S. at 440, 102 S.Ct. at 3178, citing Edgar A. Levy Leasing Co. v. Siegel, 258 U.S. 242, 246-48, 42 S.Ct. 289, 291-92, 66 L.Ed. 595 (1922), and Block v. Hirsh, 256 U.S. 135, 153-58, 41 S.Ct. 458, 459-60, 65 L.Ed. 865 (1921). “In none of these cases,” the Court held, “did the government authorize the permanent occupation of the landlord’s property by a third party.” Id. Under these circumstances, the Tenancy Act obviously does not fall within the proscription of Loretto.

We also hold that the Tenancy Act is not a taking for a “public use.”12 The installation at issue in Loretto is the exemplar of a public use. The challenged New York law authorized an occupation of private property by a common carrier, Teleprompter, engaged in a classic public utility function.13 The carrier’s installation of “crossover” and “noncrossover” cables on the plaintiff’s roof, 458 U.S. at 422, 102 S.Ct. at 3180, afforded broadcasters a common means of communication with tenants in the plaintiff’s building and in the adjacent area. Consequently, Loretto cannot reasonably be read without an awareness of the public use involved in the taking. Loretto plainly does not hold that a “permanent physical occupation” is a taking without regard for the public use of the property.

Moreover, Loretto itself confirmed the age-old distinction between regulation and public use.14 Writing for the Court, *302Justice Marshall approved the state government’s “broad power to regulate housing conditions in general and the landlord-tenant relationship in particular without paying compensation for all economic injuries that such regulation entails.” 458 U.S. at 440, 102 S.Ct. at 3179. The Court’s citations in support of this longstanding proposition include Edgar A. Levy Leasing Co. v. Siegel, 258 U.S. 242, 42 S.Ct. 289, 66 L.Ed. 595 (1922), and Block v. Hirsh, 256 U.S. 135, 41 S.Ct. 458, 65 L.Ed. 865 (1921). Levy upheld a New York statute similar to the Anti-Eviction Act and the Tenancy Act, placing limits on the landlord’s right of action to recover possession from holdover tenants. In Block, the Court upheld a District of Columbia ordinance that gave tenants a right of continued occupation following the expiration of their leases. The Court clearly assumed that the creation of the statutory tenancy for private parties was not a taking for public use.15 Statutory tenancy laws protecting holdover tenants are not takings, but merely regulations of the use to which private property may be put. Such regulations of the use of private property frequently involve costs to the owner. They are nevertheless not deemed to be takings. E.g., Goldblatt v. Town of Hempstead, 369 U.S. 590, 592-94, 82 S.Ct. 987, 989-90, 8 L.Ed.2d 130 (1962); Village of Euclid v. Ambler Realty Co., 272 U.S. 365, 386-97, 47 S.Ct. 114, 117-21, 71 L.Ed. 303 (1926) (industrial zoning); see note 16 infra. See also Sax, Takings and the Police Power, 74 Yale L.J. 36, 61-76 (1964) (terming the distinction one between government as “enterpriser” and government as “mediator”).

Where, as here, legislation does not put property to a “public use,” it is a constitutional exercise of the state’s police power provided, of course, that it satisfies the demands of due process and equal protection. Because the Tenancy Act did not put the plaintiffs’ property to public use, but rather regulated its use, the Act is not a taking under the fifth and fourteenth amendments.16

*303Finally, any doubt that Loretto made no change in the law with respect to holdover tenancies is confirmed by the Supreme Court’s summary dismissal for want of a substantial federal question in Fresh Pond Shopping Center, Inc. v. Acheson Callahan, -- U.S. --, 104 S.Ct. 218, 78 L.Ed.2d 215 (1983). Fresh Pond, an appeal from the decision of the Supreme Court of Massachusetts, rejected a challenge on taking grounds to the provisions of an ordinance of the City of Cambridge. That ordinance requires permission from the Cambridge Rent Control Board to remove occupied rental property from the housing market and to remove a tenant for that purpose. Fresh Pond had alleged that the ordinance authorized a tenant of the shopping center to remain “indefinitely.” A fortiori, Fresh Pond’s case seems stronger than that presented here. In dissenting from the Court’s summary affirmance, Justice Rehnquist relied on Loretto v. Teleprompter Manhattan C.A.T.V. Corp., 458 U.S. 419, 102 S.Ct. 3164, 73 L.Ed.2d 868 (1982), as analogous. The remaining Justices evidently did not agree.

Instructed by Mandell v. Bradley, 432 U.S. 173, 176-77, 97 S.Ct. 2238, 2240-41, 53 L.Ed.2d 199 (1977) (per curiam), we have examined the jurisdictional statement filed in Fresh Pond Shopping Center, Inc., from which it appears that virtually the same taking issue was presented to the Court as is presented here. That question is whether the creation by state law of statutory tenancies after expiration of the tenants’ leases amounts to a taking for which the state must provide compensation. The summary disposition of the appeal in Fresh Pond Shopping Center, Inc. binds this court. See Hicks v. Miranda, 422 U.S. 332, 343-45, 95 S.Ct. 2281, 2288-90, 45 L.Ed.2d 223 (1975). We hold, therefore, that the Tenancy Act constitutes neither a “permanent physical occupation” nor a “public use.”

V.

Section 14 of the Tenancy Act is not facially unconstitutional, either under article I, section 10 as an impairment of the obligation of contract, or under the fourteenth amendment as a taking of property for a public use without just compensation. The judgment appealed from will be reversed. '<