Takings Clause: Lucas, Penn Central and Just Compensation

The Fifth Amendment provides that private property shall not be taken for public use without just compensation, and it binds the states through the Fourteenth. The power it regulates — eminent domain — is not prohibited; it is priced. The government may take what it needs for public purposes, but it must pay.

The analytical difficulty is that most modern disputes do not involve the state seizing land at all. They involve regulation that leaves title untouched while destroying much of what the owner hoped to do. That is why the doctrine splits into possessory takings, which are absolute, and regulatory takings, which divide again into the categorical rule of Lucas and the balancing test of Penn Central. This guide sets out each branch, the denominator rule that quietly decides many cases, and the exaction line from Nollan to Koontz.

Diagram of Takings Clause analysis showing per se physical takings under Loretto, categorical regulatory takings under Lucas, Penn Central balancing for partial losses, the broad public use requirement after Kelo, and the denominator rule — Fig. 71 · Physical occupation, total wipeout, or partial loss — the category chosen determines the test.

Possessory takings: physical occupation is per se

Where the government physically confiscates property or permanently occupies it, there is a taking and compensation is owed. No balancing, no inquiry into how much the owner has lost, no weighing of the public benefit. The rule extends to partial occupation and to airspace as readily as to the surface.

Loretto v. Teleprompter Manhattan CATV Corp. (1982) fixes just how little is required. A statute obliged landlords to permit installation of cable equipment — a small box and some cabling on the building. The economic impact was trivial, arguably positive for the property, and the public benefit obvious. It was still a per se taking, because the intrusion was permanent and physical. The character of the invasion, not its magnitude, is what triggers the rule.

Two distinctions keep this branch tidy. Permanence matters: a temporary entry is assessed differently from a permanent occupation. And occupation must be distinguished from restriction — forbidding an owner to build is regulation, whereas installing something on the land is occupation. Where the facts describe anything the government or its licensee physically places on or takes from the property, start here and stop.

Lucas: destroying all economically beneficial use

Regulation that leaves the owner in possession can still be a taking. Lucas v. South Carolina Coastal Council (1992) established the categorical rule: where a regulation deprives an owner of all economically beneficial use of the property, that is a taking without further balancing.

The word doing the work is “all”. A regulation that reduces value dramatically is not within Lucas; a mere decline in market value, however painful, does not amount to a taking. The claimant must show the property has been rendered economically valueless, which is a demanding threshold and one the denominator rule makes harder still.

There is one significant escape for the government. No taking occurs where the state shows that background principles of its own property and nuisance law already prohibited the use. If building on the land would always have been an actionable nuisance, the regulation has taken nothing the owner ever had. Note carefully what this does not permit: the defence is confined to pre-existing background law. A newly enacted environmental or planning policy, however meritorious, is a regulation rather than a background principle, and asserting a strong public interest is not a substitute.

Penn Central: balancing partial losses

Where there is no physical occupation and no total wipeout, the case is governed by the three ad hoc factors from Penn Central Transportation Co. v. New York City (1978). None is dispositive, and the exercise is deliberately fact-specific.

The economic impact on the owner. How much value has actually been lost, measured against the whole property rather than the restricted part.
Interference with reasonable investment-backed expectations. What the owner legitimately planned and relied upon, judged against the regulatory landscape when the property was acquired.
The character of the government action. Whether the measure resembles a physical invasion or a targeted imposition on one owner — which weighs towards a taking — or is a broad public programme adjusting the benefits and burdens of economic life generally, which weighs against.

The third factor is the one that most often decides the outcome and the one most often skipped. A landmark-preservation ordinance applying across a city, or a zoning scheme applying across a district, is a general adjustment of burdens; singling out one parcel for a restriction that serves the public at that owner’s expense looks much more like an appropriation. Expectations also deserve care: only substantial construction undertaken in reliance on a valid permit creates a vested right. Preliminary expenditure on feasibility studies, design work and marketing does not.

Exam tip: fix the denominator before you classify the case. Restricting ten acres of a hundred-acre parcel is a ninety per cent retained value, not a total wipeout — so it is Penn Central, not Lucas.

The denominator rule

Economic impact is measured against the property as a whole, not against the portion the regulation restricts. If ten of a hundred acres become unbuildable, the denominator is one hundred acres. The owner has lost a tenth of the parcel’s development potential, not the entirety of the affected strip.

This is why so many claims that look categorical on first reading collapse into balancing. A claimant naturally frames the loss as total by defining the property narrowly — the restricted strip, the wetland portion, the setback area. The rule refuses that framing. Since Lucas requires the elimination of all economically beneficial use, and the denominator is generously drawn, genuine categorical regulatory takings are rare, and most litigation ends up in Penn Central.

Public use, and exactions

Even a plain taking is lawful if it is for public use and compensated. Kelo v. City of New London (2005) read the public-use requirement expansively: economic development qualifies, and property may be transferred to private developers as part of an integrated redevelopment plan. The practical effect is that public use rarely defeats a taking, and the real contest is almost always over whether a taking occurred and what compensation is due. Many states responded by enacting statutory limits on economic-development takings, which is a matter of state law rather than federal doctrine.

The exaction cases sit at the junction of takings and unconstitutional conditions. Nollan v. California Coastal Commission (1987) requires an essential nexus between a permit condition and the harm the permit requirement addresses. Dolan v. City of Tigard (1994) adds rough proportionality between the exaction and the development’s projected impact. Koontz v. St. Johns River Water Management District (2013) closed the obvious loopholes: the analysis applies where the permit is refused for declining the condition, and where the demand is for money rather than land.

Compensation itself is measured by fair market value at the time of the taking — what a willing buyer would pay a willing seller — rather than by the owner’s subjective valuation or the gain the government expects to realise.

Government action	Category
Permanent installation of equipment on a building	Physical (Loretto)
Permanent occupation of airspace	Physical
Ban on all construction, land now valueless	Categorical (Lucas)
Ban on construction where background nuisance law applied	Lucas exception
Landmark designation, current use continues	Penn Central
Restriction on part of a larger parcel	Denominator rule
Transfer to a private developer for redevelopment	Public use (Kelo)
Permit condition with no nexus or proportionality	Exaction (Nollan, Dolan)
Monetary demand, or denial for refusing a condition	Exaction (Koontz)

Table 1 · Classifying the action, and the consequence of the classification.

Worked example

City Z designates a privately owned century-old building as a historic landmark. The owner may not demolish it or materially alter the exterior without approval, but may continue operating the offices and retail units, may renovate the interior, and may sell or lease freely. The owner establishes that market value has fallen by roughly thirty per cent, because a larger and more profitable building can no longer be erected on the site, and sues for compensation.

Work through the categories in order. There is no physical occupation — nothing has been installed and nobody has entered — so Loretto is out. Nor is this a total wipeout: the building remains in profitable commercial use and remains saleable, so Lucas is out as well, and the loss of the most profitable potential use is not the loss of all economically beneficial use. That leaves Penn Central. On economic impact, a thirty per cent diminution is real but well short of decisive on its own. On investment-backed expectations, the owner has not been prevented from continuing the use actually being made of the property; the frustrated plan was a hoped-for future redevelopment, which is a weaker expectation than an existing operation. On character, a landmark-preservation ordinance applying across the city is a broad public programme adjusting burdens generally, not a targeted imposition on this owner — and that factor weighs heavily against a taking. On balance, no compensation is owed.

Change one fact. Suppose the ordinance had also required the owner to open the lobby to the public for guided tours during business hours. That is a permanent physical invasion authorised by the state, and under Loretto the balancing exercise never begins — the magnitude of the burden becomes irrelevant and compensation is owed for the occupation, however modest. The same statute, one added clause, and an entirely different branch of the doctrine.

Common mistakes that cost points

Treating a steep fall in market value as a taking. Diminution alone is not enough; Lucas requires the elimination of all economically beneficial use.
Ignoring the denominator rule and defining the property as the restricted portion. Measure against the whole parcel.
Balancing a physical occupation. Loretto is per se, and the economic impact is irrelevant to whether a taking occurred.
Treating a new regulation as a background principle of property law. The Lucas defence is confined to pre-existing nuisance and property doctrine.
Skipping the character-of-the-action factor, which is frequently what decides a Penn Central case.
Treating preliminary outlay as a vested right. Only substantial construction in reliance on a valid permit qualifies.
Arguing that public use defeats the taking. After Kelo the requirement is read broadly and rarely does any work.
Overlooking Koontz where the permit was refused, or where the demand was for money rather than land.

Frequently asked questions

Is a large drop in property value a taking?

Not by itself. A regulatory taking requires either a permanent physical occupation or the elimination of all economically beneficial use. Anything short of that is assessed under Penn Central balancing, where a substantial diminution is one factor among three and rarely carries the case alone.

What is the denominator rule?

It fixes what the loss is measured against: the whole parcel, not the regulated part. Restrict ten acres of a hundred-acre holding and the owner retains ninety per cent of the property’s potential, so there is no total wipeout and the case proceeds under Penn Central rather than Lucas.

Can the government take property and give it to a private developer?

Yes, if the taking serves a public purpose and just compensation is paid. Kelo held that economic development satisfies the public-use requirement even where title passes to private parties under a redevelopment plan. Many states have since restricted such takings by statute, so the state-law position must always be checked.

Takings law in California and Los Angeles County in 2026

California does not simply mirror the federal test. Article I, section 19 of the state constitution requires compensation when property is “taken or damaged” for public use, and that extra word matters: California recognises inverse condemnation claims for physical damage caused by public improvements on something close to a strict liability basis, without the fault showing a negligence claim would demand. A Los Angeles County homeowner whose lot is undermined by a county flood control channel or a municipal water main is therefore in a materially stronger position under state law than the federal Fifth Amendment alone would suggest.

The procedural route also differs. Eminent domain in California runs through title 7 of the California Code of Civil Procedure, which governs the resolution of necessity, deposit of probable compensation, and the owner’s right to a jury on valuation. Because Knick v. Township of Scott (2019) removed the old requirement to exhaust state compensation procedures first, a 2026 claimant in Los Angeles County can often choose between the Los Angeles Superior Court and the federal Central District of California, and that choice drives everything from jury pool to appellate law.

Several features are distinctly local and worth knowing before you advise anyone here:

Redevelopment takings are largely gone. California dissolved its redevelopment agencies in 2011, and Proposition 99 (2008) already barred taking an owner-occupied residence to convey it to a private party. The Kelo scenario is close to a dead letter in the state, so do not assume federal permissiveness translates into state practice.
Exactions are the live battleground. Los Angeles County Regional Planning and the City of Los Angeles routinely attach dedications, setbacks and impact fees to entitlements. Sheetz v. County of El Dorado (2024) confirmed that legislatively imposed conditions are not exempt from the Nollan and Dolan nexus and rough proportionality tests, which reopened a great deal of fee litigation.
The Mitigation Fee Act supplies the deadlines. Government Code section 66000 and following imposes short protest and limitations periods for challenging development fees. Missing them forfeits an otherwise sound constitutional argument, a trap that catches competent lawyers.
Coastal permits add a second regulator. Malibu and the Santa Monica Bay shoreline sit inside the coastal zone, so a Coastal Commission condition can be the operative government act rather than any county decision.
Rent and tenancy rules are regulatory, not possessory. Los Angeles County and City rent stabilisation and eviction limits are analysed under Penn Central balancing, not as physical occupations, and courts have consistently rejected the per se framing.
Wildfire and utility claims are a distinct stream. Inverse condemnation against investor-owned utilities has reshaped California liability exposure, and the doctrine is state constitutional rather than federal.

For 2026 the practical instruction is to plead both constitutions, calendar the statutory fee deadlines immediately, and treat the state claim as the stronger one where physical damage is involved. Read this alongside the unconstitutional conditions doctrine, which supplies the reasoning Sheetz applied, and easements, since many exactions are dedications of an easement interest. Confirm current fee schedules and local ordinances directly with the county before relying on any figure, because these change annually.

Next steps

The exaction cases straddle two doctrines, so read this alongside the unconstitutional conditions doctrine, which applies the same nexus reasoning to benefits generally. For the other constitutional constraints on state interference with economic arrangements, see the Contracts Clause and substantive due process. Where the complaint is about the process by which a designation or permit decision was made rather than its substance, the relevant framework is procedural due process.

The opinions in Lucas and Penn Central are the two most useful to read in full and are freely available through Justia’s Fifth Amendment collection. Cornell’s Legal Information Institute keeps a concise entry with current citations, and candidates should confirm the tested scope against the outlines published by the State Bar of California.