willing to reconsider the drilling permits after EPA had rendered its decision. This supplemental decision also stated that, although the prior denial had been final for the purposes of appeal, it was actually a decision to delay a final determination. Nonetheless, Bass continued to pursue its claim in court.
At trial, the Court of Federal Claims held that the government had permanently taken Bass’ property interest in the lease and assessed $8,938,736 plus interest as just compensation. The court explicitly refused to consider a temporary taking theory because in its view such “analysis requires an end to the government regulation in order to measure the taking.” Bass, 35 Fed. Cl. at 617 n. 2 (citing Dufau v. United States, 22 Cl.Ct. 156 (1990) and *1902 Atlantic Ltd. v. United States,* 26 Cl.Ct. 575 (1992)).
DISCUSSION
On appeal from the Court of Federal Claims, we review questions of law de novo and questions of fact for clear error. See Columbia Gas Sys., Inc. v. United States, 70 F.3d 1244, 1246 (Fed.Cir.1995). Whether a taking compensable under the Fifth Amendment has occurred is a question of law based on factual underpinnings. See Penn Central Transp. Co. v. City of New York, 438 U.S. 104, 124, 98 S.Ct. 2646, 2659, 57 L.Ed.2d 631 (1978) (establishing legal criteria to guide the “essentially ad hoc, factual inquiries”); see also Lucas v. South Carolina Coastal Council, 505 U.S. 1003, 1030-31, 112 S.Ct. 2886, 2901-02, 120 L.Ed.2d 798 (1992); Branch v. United States, 69 F.3d 1571, 1579, 1583 (Fed. Cir.1995). Whether a taking is permanent is a question of law. See Yuba Natural Resources, Inc. v. United States, 821 F.2d 638, 640 (Fed.Cir.1987).
Government regulation will effect a taking under the Fifth Amendment “where regulation denies all economically beneficial or productive use” of one’s property. See Lucas, 505 U.S. at 1015, 112 S.Ct. at 2893 (1992). The proper measure of just compensation is that which will put the owner “in as good a position pecuniarily as he would have occupied if his property had not been taken.” Yuba, 821 F.2d at 640 (quoting United States v. Miller, 317 U.S. 369, 373, 63 S.Ct. 276, 279-80, 87 L.Ed. 336 (1943)). The just compensation for a permanent taking is generally the fair market value of the property taken, whereas the recovery for a temporary taking is generally the rental value of the property. See id. at 641.
The government only contests the trial court’s determination that its actions constituted a permanent taking. The government argues that, instead, the government’s steps in evaluating Bass’ lease constitute at most a temporary taking because, at some definite point in the near future, the government will make a determination of whether to condemn Bass’ lease. Moreover, the government urges that any alleged taking is not permanent because Congress has established the procedures through which Bass’ lease will be condemned. It argues that a court decision at this time that the lease has been permanently taken would improperly remove that determination from the agency Congress selected to make this determination. Finally, the government argues that the Court of Federal Claims erred by using a bright-line test requiring the end of regulation and for this reason refusing to receive evidence regarding a temporary taking theory. Such a bright-line rule in the government’s view is not supported by precedent.
Bass responds that, under the terms of the LWA, the existing oil and gas drilling rights in the excepted leases “shall not be affected.” Thus Bass argues that BLM should have permitted Bass to drill and that the denial resulted in a taking of its rights. In Bass’ view, this taking is permanent because the date at which the regulation will end is unknown and at best speculative. Bass argues that the denial of the permits was just that— a denial — and not a “regulatory delay,” as characterized by BLM’s supplemental decision. Moreover, Bass contends that there is no guarantee that its drilling permits will ever be granted, even after the EPA renders its decision.
We conclude that any taking involved here is not a permanent taking. Congress has expressly established a mechanism for condemning the leases at issue if deemed necessary to ensure the integrity of the WIPP