The owner still owns the land. What was taken is the use of it for a period, and the measure follows that rather than the project.
Start a conversation with Cournot, the Institute’s damages concierge, already scoped to regulatory & temporary takings. Pick a starting point, or describe the dispute directly.
A regulatory taking claim presents an economic question that looks deceptively like a valuation and is not one. The owner retains title. The land is usually still there, often worth more at the end of the dispute than at the beginning, and a measure built as though the asset were destroyed collides immediately with that fact. What was taken, on a temporary theory, is the use of the property over a defined period, and the measure conventionally follows the use rather than the asset: the return the owner would have earned on the property's value during the period, or the fair rental value of the property in the condition it was actually in. Both formulations price time. Both are typically far smaller than the profit on the development that was blocked, and understanding why is the whole subject. Development profit answers the question what would this project have earned. The taking measure answers the question what was the use of this land worth while it was denied. Those are different questions, and an opinion that offers the first as an answer to the second has not overstated a number so much as answered the wrong one, which is a harder error to recover from at deposition. Inverse condemnation raises the same measurement logic when a permanent deprivation is alleged, where the analysis moves toward before-and-after property value rather than a period of use, and the choice between temporary and permanent framing therefore drives the entire measurement approach. The valuation inputs are conventional appraisal inputs, which is why this area draws real estate appraisers and development economists rather than general forensic accountants. What is not conventional is the period definition, because a rate applied to the wrong number of months is wrong by exactly that proportion. Availability of the theory, the compensable period and the applicable measure are questions of law that vary by jurisdiction and by claim, and they belong to counsel.
Conventional appraisal inputs, applied to a period rather than to an asset.
The base the return is applied to, valued as the property stood, not as it would have stood if built.
A market return applied across the period. Its construction is attacked the way any discount rate is.
The alternative formulation: what the land in its actual condition could have been rented for over the period.
When the deprivation began and what ended it. A rate on the wrong period is wrong in exact proportion.
Whether the framing is a period of lost use or a permanent diminution changes the measure entirely.
The land often rose in value while the dispute ran, and the defense will say so.
How the Institute approaches a takings measurement question.
More than any input inside it.
It is the single most common substitution in this field, and it is not an overstatement so much as an answer to a different question. The taking theory asks what the use of the land was worth while it was denied. A development profit projection asks what the finished project would have earned. An expert who cannot articulate that distinction in one sentence will be led through it by opposing counsel instead.
It does not defeat a temporary-use theory, but it will be argued hard and it has to be met directly rather than ignored. The response is that the measure is the value of the use during the period, not the change in the asset value across it: an owner prevented from using property for two years has lost those two years of use whether the market rose or fell, in the same way that a tenant who is locked out has lost the tenancy regardless of what happened to the building price. Where appreciation genuinely bites is on a permanent-deprivation framing, where a before-and-after value comparison is the measure and a rising market can leave very little to measure. This is one of several reasons the temporary and permanent framings should be settled before valuation work starts rather than after, and why an expert who has built the wrong one has usually wasted the engagement.
On documents wherever possible, because the period multiplies every other input and is therefore the most efficient thing for the other side to attack. A defensible start date usually attaches to a specific act: an application deemed complete, a refusal, an imposed condition. The end is harder and is frequently the live dispute: approval, a judgment, the point at which the owner could in fact have proceeded, or a date argued from the record where none of those is clean. Where the end date is genuinely contested, an opinion that presents a single period without showing what the measure looks like on the alternative dates has left its most leveraged assumption undefended, and the sensible practice is the same as with any leveraged assumption, which is to show the range and argue a position inside it rather than to assert a point.
They are two routes to the same idea, and the choice is usually driven by the evidence available rather than by preference. A return-on-value approach needs a defensible property value in the property's actual condition and a defensible rate, and it is attacked on both. A fair rental value approach needs comparable ground rents or leases for property in a comparable condition and entitlement state, and it is attacked on comparability. In markets with a thin ground lease record the rental route can be difficult to support; where the property value itself is contested, the return route inherits that fight. Some experts present both and show they converge, which is persuasive when true and worth doing when it is. What neither approach tolerates is applying a rate or a rent appropriate to a completed, entitled, income-producing project to land that was none of those things during the period.
Development economics and real estate appraisal rather than general forensic accounting, and the distinction is not cosmetic. The core inputs are property valuation in a specific condition and entitlement state, market rates of return for that asset class and location, and ground lease or land rent evidence, which are appraisal competencies. Where a claim also reaches development profit or delay costs, a development economist who understands how projects are actually underwritten, financed and phased is doing work a general damages accountant is not equipped for, because the questions are about how the project would have been capitalized and built rather than about how a company's books work. Many matters need both, sequenced: the appraiser establishes value and rent, the development economist carries the project-level analysis, and a damages expert assembles the period arithmetic and the present value machinery on top.
Describe the property, the deprivation and the period. The Institute will help you separate the measures before the number is built.