[1562]*1562PLAGER, Circuit Judge.
This is a regulatory taking ease. It arose when the plaintiff Florida Rock Industries Inc. (Florida Rock) sought a permit under § 404 of the Clean Water Act1 from the Army Corps of Engineers (Corps) to mine the limestone which lay beneath a tract of wetlands. The Corps denied the permit on October 5, 1980. On May 25, 1982, Florida Rock filed suit in the United States Court of Federal Claims,2 seeking monetary compensation from the defendant United States (Government); Florida Rock alleged that the Corps’ permit denial constituted an uncompensated taking of private property for public use in violation of the Fifth Amendment.3 The Court of Federal Claims agreed, Florida Rock Indus., Inc. v. United States, 8 Cl.Ct. 160 (1985) (Florida Rock I), and awarded Florida Rock $1,029,000 plus attorney fees and simple interest. On appeal, this court vacated the judgment that a taking had occurred and remanded for further consideration. Florida Rock Indus., Inc. v. United States, 791 F.2d 893 (Fed.Cir.1986), cert. denied 479 U.S. 1053, 107 S.Ct. 926, 93 L.Ed.2d 978 (1987) (Florida Rock II). On remand, the Court of Federal Claims found that the permit denial deprived Florida Rock of all value in its land, and so again concluded that there had been a taking and reinstated the $1,029,000 damages award, this time with compound interest. Florida Rock Indus., Inc. v. United States, 21 Cl.Ct. 161 (1990) (Florida Rock III). The Government appeals both the damages award and the choice of compound rather than simple interest. We again find it necessary to vacate the judgment that there has been a taking, and remand for further consideration consistent with this opinion.
BACKGROUND
The detañed background of the case is described in the several opinions referred to above as Florida Rock I-III. We provide here only a brief overview before proceeding to the heart of the matter: whether the Corps’ denial of the § 404 permit effected a regulatory taking, thus requiring the Government to pay just compensation. The answer to that question depends on the impact the regulatory imposition had on the economic use, and hence value, of the property.
In 1972, shortly before the enactment of the Clean Water Act, Florida Rock purchased a 1,560 acre wetlands parcel in Dade County, Florida, to the west of suburban Miami. The purchase price was $2,964,000 (an average of $1,900 per acre).4 Florida Rock obtained the parcel in order to extract the underlying limestone — a process which destroys the surface wetlands.
During the 1970s, however, the ecological importance of wetlands was increasingly appreciated. The Corps in 1977 enacted regulations requiring owners of wetlands parcels to obtain permits under § 404 of the Clean Water Act before engaging in dredging or filling activities. See generally United States v. Riverside Bayview Homes, Inc., 474 U.S. 121, 123-24, 106 S.Ct. 455, 457, 88 L.Ed.2d 419 (1985). Not long after, Florida Rock began mining operations on the parcel, without having applied for a § 404 permit. The Corps issued a cease and desist order on September 7, 1978. Florida Rock stopped mining, restored the area as best it could, and began negotiating with the Corps for the permit.
Initially, Florida Rock sought a permit for the entire 1,560 acres. The Corps responded [1563]*1563that permits would be issued only for parcels of a size to suffice for three years of mining; in Florida Rock’s ease, 98 acres would serve its anticipated needs for three years. Florida Rock acquiesced in the Corps’ demand and applied for a permit covering only the 98 acre parcel at issue here. After considering the revised application, the Corps concluded that the proposed mining would cause irremediable loss of an ecologically valuable wetland parcel and would create undesirable water turbidity. The permit application was denied on October 2, 1980.
Florida Rock, conceding the validity of the Corps’ actions,5 filed suit in the United States Court of Federal Claims, alleging that the permit denial was an uncompensated regulatory taking of its land. In Florida Rock I, the Court of Federal Claims found that the value of the parcel before the taking was $10,500 per acre and that the value after the taking was negligible because rock mining— in the view of the court, the only viable economic use — had been foreclosed. Florida Rock I, 8 Cl.Ct. at 164 (citing Hodel v. Virginia Surface Mining and Reclamation Ass’n, 452 U.S. 264, 295-96, 101 S.Ct. 2352, 2370, 69 L.Ed.2d 1 (1981)). The Court of Federal Claims concluded that the permit denial was a regulatory taking, for which the landowner must be compensated. Florida Rock I, 8 Cl.Ct. at 165.
On appeal to this court, that judgment was vacated in Florida Rock II. The Federal Circuit held that the Court of Federal Claims in determining the after-taking value of the affected property had erred in focusing on immediate use — the proper focus should instead have been on a determination of “fair market value.” Id., 791 F.2d at 903. The case was remanded to the Court of Federal Claims for further proceedings.
On remand, the Court of Federal Claims entertained evidence seeking to establish the fair market value of the property subsequent to the permit denial. The Government presented two assessors, Mr. Slack and Mr. Cantwell, who had investigated contemporaneous land sales in the area. Using the standard comparable sales valuation method, one assessor concluded that the property had a fair market value of $4,000 per acre, while the other found a value of $4,615 per acre. In addition, Florida Rock had received actual purchase offers in the range of $4,000 per acre. The President of Florida Rock Industries, Mr. Edward Baker, testified that he believed the property to be worth $10,000 per acre, even after the Corps’ permit denial (thus presumably explaining why all such purchase offers were declined).
Finally, the Government presented a state court opinion which had affirmed the state’s tax assessment of $4,089,950 for the 1,560 acre parcel, based on comparable sales of nearby parcels during the 1979-1982 time period. (This assessment figure for the larger parcel reflects an average value of $2,621.76 per acre; see supra note 3.) Florida Rock Indus., Inc., v. Bystrom, 485 So.2d 442, 444-45 (Fla.App.1986), review denied, 492 So.2d 1332 (1986) (Bystrom). That assessment was based on comparable sales which presumably reflected the market’s evaluation of present and future land use restrictions. Id. at 444 and 447.6
Florida Rock, on the other hand, read Florida Rock II to require a detailed inquiry [1564]*1564into the motivations and sophistication of buyers of the comparable properties upon which assessment was based. It crafted a survey — viewed by the Court of Federal Claims to be “admittedly novel,” Florida Rock III, 21 Cl.Ct. at 173 — and concluded that virtually all the buyers of the comparable properties were lacking in sufficient knowledge in order for their purchases to qualify as truly comparable sales. Florida Rock’s assessor, Mr. Failla, used the results of this survey to justify discarding evidence that the average retail price of parcels in the vicinity of Florida Rock’s land was $6,100 per acre, and concluded that the actual fair market value of the tract following the permit denial was negligible. Implicit in this result is the assumption that no one with full knowledge of the regulatory regime would be willing to gamble that concern for the ecological importance of the wetlands would give way in the future to the economics of development pressure from nearby Miami. The Court of Federal Claims in Florida Rock III agreed with Florida Rock’s view of the matter, and decided accordingly.
DISCUSSION
A.
How to determine whether a regulatory taking under the Fifth Amendment has occurred is a subject of on-going debate.7 The Supreme Court has provided various articulations, influenced, as could be expected, by the particular circumstances of the cases before it. One formula that has emerged and has been repeated in several cases requires that the court balance several pragmatic considerations in making its regulatory takings determination. These considerations include: the economic impact of the regulation on the claimant, the extent to which the regulation interferes with investment-backed expectations, and the character of the Government action. (The leading case is Penn. Central Transp. Co. v. New York City, 438 U.S. 104, 124, 98 S.Ct. 2646, 2659, 57 L.Ed.2d 631 (1978) (Penn Central)). In this appeal, it is the economic impact of the regulation that is at issue.8
The recent Supreme Court decision in Lucas v. South Carolina Coastal Council, 505 U.S. -, 112 S.Ct. 2886, 120 L.Ed.2d 798 (1992) (Lucas), teaches that the economic impact factor alone may be determinative; in some circumstances, no balancing of factors is required. If a regulation categorically prohibits all economically beneficial use of land — destroying its economic value for private ownership — the regulation has an effect [1565]*1565equivalent to a permanent physical occupation.9 There is, without more, a compensable taking.10
If, however, a regulation prohibits less than all economically beneficial use of the land and causes at most a partial destruction of its value, the case does not come within the Supreme Court’s ‘categorical’ taking rule. As we explain below, we reject the trial court’s analysis that led to its conclusion that all economically beneficial use of the land was taken by the Government. We remand for determination of what economic use as. measured by market value, if any, remained after the permit denial, and for consideration of whether, in light of the properly assessed value of the land, Florida Rock has a valid takings claim.
B.
In Florida Rock II this court stated that, with regard to the property at issue, although “there may be a question what knowledgeable buyers would have paid, but that they would have paid some substantial figure seems certain.” Id., 791 F.2d 893 at 903. The trial court on remand was instructed: “if there is found to exist a solid and adequate fair market value (for the 98 acres) which Florida Rock could have obtained from others for that property, that would be a sufficient remaining use of the property to forestall a determination that a taking had occurred or that any just compensation had to be paid by the government.” Id. We did not discuss what residual fair market value would be “adequate” to forestall a taking determination.
We did explicitly indicate that the Court of Federal Claims should give consideration to “a relevant market made up of investors who are real but are speculating in whole or major part.” Florida Rock II, 791 F.2d at 903 (citing Bystrom, 485 So.2d at 447; emphasis added). The court noted the testimony of the Government’s assessor, Mr. Cant-well, and said:
We are of the opinion that Mr. Cantwell’s testimony, if considered and believed, established the existence of a market in which Florida Rock could have disposed of the property and mitigated the severity of the regulatory action here involved.
Id. And while the court stated that “we take it for granted, as Mr. Cantwell did, that the ‘willing buyer’ of the market value formula has got to be one who is correctly informed about the physical character of the land, as well as legal restrictions on its use ...” id. at 902, we also indicated that the market as a whole was not dominated by persons engaged in fraudulent or illegal behavior:
Since the tract was not listed for sale, the $4,000 per.acre offer, the frequent inquiries, and the assessed value, must have reflected interest of knowledgeable people, not foreigners or gulls.11
Id. In short, we understand Florida Rock II to hold that purchases which are made by market speculators as well as home bufiders and other developers are comparable sales, with the caveat that particular sales might be discarded by the assessor if those sales appear questionable in light of the market as a whole.
Florida Rock, and the Court of Federal Claims on remand in Florida Rock III, read Florida Rock II differently. Our passing reference to buyers being “correctly informed” was read to require a detailed inquiry into the motivation and sophistication of the buyers whose purchases comprised the comparable sales used in the fair market value assessment. The Court of Federal Claims rejected the testimony of Mr. Cant-well — the same testimony which we had not[1566]*1566ed with approval in Florida Rock II — solely because Mr. Cantwell, with little exception, assumed sufficient knowledge on the part of the purchasers. Florida Rock II, 21 Cl.Ct. at 172. Instead, the court accepted the testimony of Florida Rock’s assessor, who rejected all of the comparable sales values on the principle that none of the purchasers were sufficiently sophisticated and knowledgeable. That was error — contrary to our instruction in Florida Rock II, contrary to generally accepted understandings of market valuation, and finally, contrary to the working assumptions of a free market.12
There is no disagreement as to the facts regarding the existence and nature of the market. Florida Rock’s study identified in the immediate vicinity of the 98 acre tract 240 land sales during the period, 1971 through 1987. A significant number of those sales occurred in the early 1980s, despite the intervening change in the regulatory environment. The average sales price per acre in 1980 was $6,100. The price per acre varied predominantly as a function of the overall lot size; smaller lots commanded higher per acre prices. Florida Rock’s survey indicated that roughly 80% of the buyers had purchased the land for ‘investment’ purposes and that, overall, the purchasers intended to hold the land for an average of 9 to 10 years.
Thus, there was an active though speculative investment market for Florida Rock’s land at the time of and following the permit denial. Accord, Bystrom, 485 So.2d at 447-48. The fair market price which Florida Rock could have commanded at that time remains, still, to be determined, but it was certainly much higher than the nominal $500 per acre value accepted by the Court of Federal Claims.
Florida, Rock’s survey does indicate that most of the buyers in this market did not have extensive knowledge of the provisions of the Clean Water Act and its impact on the development potential of those properties involving wetlands. It is doubtful that any legal conclusions should be drawn from this. Such broad-based disregard for current land use regulations suggests that, while parties contract in the shadow of the law, long term market trends in real estate values are not necessarily correlated to Government controls. The Government’s appraisers testified that detailed knowledge of regulatory constraints was relevant only when the goal of the purchasers was immediate development. And as Mr. Slack testified, “there was not really a demand for property this far out [from Miami] at this time. People were not buying it to do anything with it right then anyway.”
A speculative market may exist in land that is regulated as well as in land that is not, and the precise content of regulations at any given time may not be particularly important to those active in the market. As this court observed in Florida Rock II, 791 F.2d 893 at 902-03, yesterday’s Everglades swamp to be drained as a mosquito haven is today’s wetland to be preserved for wildlife and aquifer recharge;13 who knows what tomorrow’s view of public policy will bring, or how the market will respond to it.
[1567]*1567We need not decide such speculative questions here. The uneontroverted evidence of an active real estate market compels the conclusion that the typical “willing buyer-willing seller’ requirement of fair market value had been met; it would be inappropriate for a court to substitute its own judgment of value for that of the market. While an assessor might be justified in adjusting the fair market value figure by discarding aberrational values based upon sales between related entities or fraudulent sales to widows and orphans, an assessor may not discard an entire market as aberrational.14 ‘Aberrational’ means outside the norm established by general activity. The fact that many players in the market chose to disregard the immediate potential for development in favor of a long-term perspective — hardly unusual behavior in Florida’s history of real estate investment — does not make the market as a whole ‘aberrational.’ When the market provides a well-substantiated value for a property, a court may not substitute its own judgment as to what is a wise investment.
It was error to read Florida Rock II as requiring a detailed inquiry into the motivation and sophistication of the buyers of comparable parcels. Dollars are fungible; a speculative market provides a landowner with monetary compensation which is just as satisfactory as that provided by any other market. Should a landowner wish to pick and choose her buyers, that luxury is not chargeable to the federal fisc. To conclude otherwise would be tantamount to concluding that there could never be a market fueled by speculation — a conclusion at odds both with common sense and with our directions in Florida Rock II.
C.
Ultimately, the question that must be answered is whether, as a result of the denial of certain economic uses, there was a taking of Florida Rock’s property by the Government. This question turns on “the economic impact of the regulation on the claimant,” Penn Central, 438 U.S. at 124, 98 S.Ct. at 2659, measured by the change, if any, in the fair market value caused by the regulatory imposition. On the state of the record before us we are unable to answer the question. The Court of Federal Claims answered it with a straightforward ‘yes’ when the per acre value of the 98 acre parcel after the permit denial was found to be only a nominal $500 per acre, as compared to the $10,500 found by the trial court to be the per acre value prior to the permit denial. This represented a loss in value of roughly 95%. Florida Rock III, 21 Cl.Ct. at 175. The court in effect treated the permit denial as essentially a ‘categorical’ taking of all economic use. See Lucas, 505 U.S. at -, 112 S.Ct. at 2893. “The second situation in which we have found categorical treatment appropriate is where regulation denies all economically beneficial or productive use of land.” Id.
The Court of Federal Claims’ analysis was correct in theory, but started from an incorrect premise — that the value of the parcel after denial of the permit was a nominal $500 per acre. When a figure closer to $4,000 per acre is substituted, the correct outcome is no longer clear. On remand, with a fair market value calculated in accordance with this opinion, the Court of Federal Claims must again return to the approach dictated by Florida Rock II:
[T]he court should consider, along with other relevant matters, the relationship of the owner’s basis or investment, and the fair market value before the alleged taking to the fair market value after the alleged taking. In determining the severity of the economic impact, the owner’s opportunity to recoup its investment or better, subject to the regulation, cannot be ignored.
Id., 791 F.2d at 905.
The Court of Federal Claims must reconsider the assessments proffered by the par[1568]*1568ties and other evidence in the record, and determine a fair market value accordingly.15 Should that determination establish, as the evidence in the record suggests, that there was some (but not a total) reduction in the overall market value of plaintiffs property as a result of the regulatory imposition, the question will then be posed: does that reduction constitute a taking of property compen-sable under the Fifth Amendment?16
To answer this question requires the court to resolve two preliminary issues. The first is whether a regulation must destroy a certain proportion of a property’s economic use or value in order for a compensable taking of property to occur. The second is how to determine, in any given case, what that proportion is.
Since the Supreme Court’s decision in Pennsylvania Coal v. Mahon, 260 U.S. 393, 43 S.Ct. 158, 67 L.Ed. 322 (1922) (Pennsylvania Coal), the problem for courts has been to determine the extent to which the Fifth Amendment burdens the exercise of the police power through regulation,17 that is, to determine when a particular regulation somehow — in the words of Justice Holmes— goes “too far,” id at 415, 43 S.Ct. at 160, and therefore effects a taking.18 It is now clear that a regulation that constitutes a total deprivation of economically beneficial use goes “too far;” such a regulatory imposition re-suits in a ‘categorical’ taking similar to a physical taking of property.19 Lucas, 505 U.S. -, 112 S.Ct. 2886.
The question remains, does a partial deprivation resulting from a regulatory imposition, that is, a situation in which a regulation deprives the owner of a substantial part but not essentially all of the economic use or value of the property, constitute a partial taking, and is it compensable as such? This question has been much debated in the literature since the Supreme Court’s decision announcing that as a general proposition regulatory takings are compensable; the Court’s decisions to date have not provided an answer.20
Nothing in the language of the Fifth Amendment compels a court to find a taking only when the Government divests the total ownership of the property; the Fifth Amendment prohibits the uncompensated taking of private property without reference to the owner’s remaining property interests. In Lucas, the Supreme Court touched upon the question of a partial regulatory taking, see 112 S.Ct. 2893-95, but, concluding on the facts before it that the case was one in which the owner was called upon “to sacrifice all economically beneficial uses in the name of the common good,” id at -, 112 S.Ct. at 2895, the Court found a categorical taking and thus did not have to decide the partial [1569]*1569taking question.21 Id. at - n. 9, 112 S.Ct. at 2896 n. 9.
Justice Stevens, writing separately, criticized as arbitrary the notion that “[a] landowner whose property is diminished in value 95% recovers nothing, while an owner whose property is diminished 100% recovers the land’s full value.” Id. at -, 112 S.Ct. at 2919, Stevens, dissenting. In response, Justice Scalia, writing for the Court, noted that Justice Stevens’s analysis “errs in its assumption that the landowner whose deprivation is one step short of complete is not entitled to compensation.” Id. at -, 112 S.Ct. at 2894 n. 8.22
No such conceptual problem seems to exist when the taking is by physical occupation. If a property owner owns a 100 acre tract, and the Government takes 95 acres for a public park, no one would argue that the five acres remaining somehow precludes the property owner from claiming entitlement to just compensation for the loss of the 95. Indeed, if the Government took just 5 acres and left the property owner with 95, there would be no question that the owner was entitled to compensation for the parcel taken (plus severance damages attributable to the remaining tract).23
Courts have held that even relatively minor physical occupations are compensable. Loretto v. Teleprompter Manhattan CATV Corp., 458 U.S. 419, 102 S.Ct. 3164, 73 L.Ed.2d 868 (1982); Hendler v. United States, 952 F.2d 1364 (Fed.Cir.1991). Logically, the amount of just compensation should be proportional to the value of the interest taken as compared to the total value of the property, up to and including total deprivation, whether the taking is by physical occupation for the public to use as a park, or by regulatory imposition to preserve the property as a wetland so that it may be used by the public for ground water recharge and other ecological purposes.24
The felt need for some kind of a special rule in regulatory takings eases may stem from the difficult line that has to be drawn between a partial regulatory taking and the mere ‘diminution in value’ that often accompanies otherwise valid regulatory impositions. As expressed by Justice Holmes in Pennsylvania Coal, “Government hardly could go on if to some extent values incident to property could not be diminished without paying for every such change in the general law. As long recognized, some values are enjoyed under an implied limitation and must yield to the police power. But obviously the implied limitation must have its limits, or the contract and due process clauses are gone.” Id., 260 U.S. at 413, 43 S.Ct. at 159. Gone as well, it is almost superfluous to add, would be the constraints imposed on the Government by the takings clause.
One way to avoid this linedrawing problem would be to declare that no regulatory taking is compensable under the Fifth Amendment; the only available remedy for a regulation that goes ‘too far’ is invalidation of the impo[1570]*1570sition. That was the historic practice in the courts for much of the twentieth century, but the Supreme Court definitively rejected that practice in First English Evangelical Lutheran Church v. Los Angeles County, 482 U.S. 304, 107 S.Ct. 2378, 96 L.Ed.2d 250 (1987). The Fifth Amendment “is designed ‘not to limit the governmental interference with property rights per se, but rather to secure compensation in the event of otherwise proper interference amounting to a taking.’ ” Preseault v. ICC, 494 U.S. 1, 11, 110 S.Ct. 914, 921, 108 L.Ed.2d 1 (1990) (quoting First English, 482 U.S. at 315, 107 S.Ct. at 2385; emphasis in both cases).25 Nothing in the Fifth Amendment limits its protection to only ‘categorical’ regulatory takings, nor has the Supreme Court or this court so held.26 Thus there remains in cases such as this the difficult task of resolving when a partial loss of economic use of the property has crossed the line from a noncompensable ‘mere diminution’ to a compensable ‘partial taking.’
The trial court will find itself with little direct case law guidance. As Pennsylvania Coal and subsequent appellate court decisions have recognized, the question of when a regulatory taking occurs cannot be answered as a matter of absolute doctrine, but instead requires case by case adjudication: “the question depends upon the particular facts.” Id., 260 U.S. 393 at 413, 43 S.Ct. at 158 at 159. See also, inter alia, United States v. Caltex, 344 U.S. 149, 156, 73 S.Ct. 200, 203, 97 L.Ed. 157 (1952); United States v. Central Eureka Mining Co., 357 U.S. 155, 168, 78 S.Ct. 1097, 1104, 2 L.Ed.2d 1228 (1958); Penn Central 438 U.S. 104 at 124, 98 S.Ct. 2646 at 2659, noting the “essentially ad hoc, factual inquiries” in takings jurisprudence. But recourse to the facts hardly solves the basic problem at hand — there simply is no bright line dividing compensable from non-compensable exercises of the Government’s power when a regulatory imposition causes a partial loss to the property owner. What is necessary is a classic exercise of judicial balancing of competing values.27
When there is reciprocity of advantage, paradigmatically in a zoning case, see, e.g., Euclid v. Ambler Realty Co., 272 U.S. 365, 47 S.Ct. 114, 71 L.Ed. 303 (1926), then the claim that the Government has taken private property has little force: the claimant has in a sense been compensated by the public program “adjusting the benefits and burdens of economic life to promote the common good.” Penn Central, 438 U.S. 104, 124, 98 S.Ct. 2646, 2659. Thus shared economic impacts resulting from certain types of land use controls have been held to be non-compensable. Agins v. Tiburon, 447 U.S. 255, 262-63, 100 S.Ct. 2138, 2143, 65 L.Ed.2d 106 [1571]*1571(1980) (shared ‘benefits and burdens’ of a zoning ordinance); Penn Central, 438 U.S. 104 at 131, 98 S.Ct. 2646 at 2662 (same).
That the purpose and function of the regulatory imposition is relevant to drawing the line between mere diminution and partial taking should not be read to suggest that when Government acts in pursuit of an important public purpose, its actions are excused from liability. To so hold would eviscerate the plain language of the Takings Clause, and would be inconsistent with Supreme Court guidance.28 It is necessary that the Government act in a good cause, but it is not sufficient. The takings clause already assumes the Government is acting in the public interest: “nor shall private property be taken for -public use without just compensation” (emphasis added).
It is for the trial court as an initial matter to determine whether the Government acted within its proper role in the circumstances presented by the case of Florida Rock. Marketplace decisions should be made under the working assumption that the Government will neither prejudice private citizens, unfairly shifting the burden of a public good onto a few people, nor act arbitrarily or capriciously, that is, will not act to disappoint reasonable investment-backed expectations. The Government, in a word, must act fairly and reasonably, so that private parties can pursue their interests. At the same time, when Government acts as the intermediary between private interests to provide a mutually beneficial environment from which all benefit and in which all can thrive, the shared diminution of free choice that results may not rise to the level of constitutionally required compensation.
In addition, then, to a demonstration of loss of economic use to the property owner as a result of the regulatory imposition — a fact yet to be properly determined in this case— the trial court must consider: are there direct compensating benefits accruing to the property, and others similarly situated, flowing from the regulatory environment? Or are benefits, if any, general and widely shared through the community and the society, while the costs are focused on a few? Are alternative permitted activities economically realistic in light of the setting and circumstances, and are they realistically available? In short, has the Government acted in a responsible way, limiting the constraints on property ownership to those necessary to achieve the public purpose, and not allocating to some number of individuals, less than all, a burden that should be borne by all?
Admittedly this is not a bright line, simply drawn. Property owners and regulators, attempting to predict whether a governmental regulation has gone too far, will still need to use judgment- and exercise care in making decisions. In this sense our decision today continues the tradition of ad hoc judicial decisionmaking in .this area. Over time, however, enough cases will be decided with sufficient care and clarity that the line will more clearly emerge.
The dissent rejects drawing the line between non-compensable ‘mere diminution’ land use regulatory restraints and compensa-ble takings of property interests that involve less than all of the fee estate. The dissent favors an all or nothing approach — if some critical threshold of value loss is reached as a result of the regulatory imposition, then the property owner is entitled to compensation for the taking of the entire fee. This is, of course, another way. to handle the problem of partial takings, but there are serious problems with the dissent’s approach.
If the dissent’s approach provided a bright line and avoided the ad hocery problem, that might argue in its fávor. But it does not. Determining the threshold in any given case which, under the dissent’s view would trigger full compensation, requires the same sort of weighing and balancing of indeterminate factors. Furthermore, the dissent endorses the questionable policy of forcing the Government to pay for something it does not want and has not taken. The dissent’s approach requires the Government to pay for the ‘fee’ in the land — i.e., the entire bundle of [1572]*1572rights — even though the Government may be seeking only to restrict certain kinds of development or certain uses. This has the potential of unfairness to both the Government and the property owner. The latter may wish to be paid for what she has lost but keep the rest; and the Government should not be put to the obligation of paying for more than it wants when it does not set out to take it.29- The property owner is entitled to just compensation for what is taken, no less, but no more.30
The dissent is concerned that what is being taken is ‘value,’ not property.31 In fact, in a regulatory context such as this it is both. By taking some portion of Florida Rock’s economic use of the property — its power to disturb the overlying wetlands, and with it the common law property right to mine its subsurface minerals — the Government appears to have destroyed part of the value of Florida Rock’s holdings. If that proves to be the case, and if the application of the ad hoc tests previously described so warrant, the property interest taken belongs to the Government, and the right to just compensation for the interest taken belongs to Florida Rock.32
The Supreme Court did not have any difficulty in finding that a property interest was taken when the Government authorized the installation of a small cable box on an apartment building; the Government was not required to buy the building. Loretto v. Teleprompter Manhattan CATV Corp., 458 U.S. 419, 102 S.Ct. 3164, 73 L.Ed.2d 868 (1982). Nor was there any difficulty in finding a property interest taken — if it needs a label, call it a limited co-tenancy with an easement for access — when the Government sank wells on an owner’s property and periodically entered to service the wells and to make tests of the water. Hendler v. United States, 952 F.2d 1364 (Fed.Cir.1991). The fact that the source of any particular taking is a regulation rather than a physical entry should make no difference — the nature of legal interests defining the property affected remains unchanged.
Finally, the dissent believes that Supreme Court precedent establishes that a Fifth Amendment claim that specific property has been taken is an all or nothing proposition. If taken to mean that a regulatory taking cannot result in less than a taking of the property owner’s entire fee estate, we cannot agree. There has never been any question but that the Government can take any kind of recognized estate or interest in property it chooses in an eminent domain proceeding; it is not limited to fee interests. We see no reason or support for a different rule in inverse condemnation cases, and that is true whether the taking results from a physical or regulatory action.
In this case we have concluded that the record does not support a finding that the fee in the land, i.e., all economic use or value, was taken by this regulation, although that [1573]*1573question is still an open one to be decided by the facts of valuation properly found. Since loss of economic use and value is the issue in this regulatory taking case, it is not possible, absent a valid determination in the record of the ‘after imposition’ value of the land, to know if a taking occurred, much less what the Government must pay for it. We are compelled, therefore, to remand the matter to the trial court for a determination of that essential piece of information, and for an initial determination as to its significance in order to decide whether there is a compensa-ble taking of property.
CONCLUSION
The judgment of the Court of Federal Claims is vacated and the matter is remanded for further proceedings consistent with this opinion.
VACATED AND REMANDED.