Direct condemnation, by invocation of the State's power of eminent domain, presents different considerations from cases alleging a taking based on a burdensome regulation. In a direct condemnation action, or when a State has physically invaded the property without filing suit, the fact and extent of the taking are known. In such an instance, it is a general rule of the law of eminent domain that any award goes to the owner at the time of the taking, and that the right to compensation is not passed to a subsequent purchaser. See Danforth v. United States, 308 U. S. 271, 284 (1939); 2 Sackman, Eminent Domain, at § 5.01[5][d][i] ('It is well settled that when there is a taking of property by eminent domain in compliance with the law, it is the owner of the property at the time of the taking who is entitled to compensation').