Opinion of the Court
(1998). For that, the Court draws on “existing rules or understandings” about property rights. Ibid. (internal quotation marks omitted). State law is one important source. Ibid.; see also Stop the Beach Renourishment, Inc. v. Florida Dept. of Environmental Protection, 560 U. S. 702, 707 (2010). But state law cannot be the only source. Otherwise, a State could “sidestep the Takings Clause by disavowing traditional property interests” in assets it wishes to appropriate. Phillips, 524 U. S., at 167; see also Webb’s Fabulous Pharmacies, Inc. v. Beckwith, 449 U. S. 155, 164 (1980); Hall v. Meisner, 51 F. 4th 185, 190 (CA6 2022) (Kethledge, J., for the Court) (“[T]he Takings Clause would be a dead letter if a state could simply exclude from its definition of property any interest that the state wished to take.”). So we also look to “traditional property law principles,” plus historical practice and this Court’s precedents. Phillips, 524 U. S., at 165–168; see, e.g., United States v. Causby, 328 U. S. 256, 260–267 (1946); Ruckelshaus v. Monsanto Co., 467 U. S. 986, 1001–1004 (1984).
Minnesota recognizes a homeowner’s right to real property, like a house, and to financial interests in that property, like home equity. Cf. Armstrong v. United States, 364 U. S. 40, 44 (1960) (lien on boats); Louisville Joint Stock Land Bank v. Radford, 295 U. S. 555, 590 (1935) (mortgage on farm). Historically, Minnesota also recognized that a homeowner whose property has been sold to satisfy delinquent property taxes had an interest in the excess value of her home above the debt owed. See Farnham v. Jones, 32 Minn. 7, 11, 19 N. W. 83, 85 (1884). But in 1935, the State purported to extinguish that property interest by enacting a law providing that an owner forfeits her interest in her home when she falls behind on her property taxes. See 1935 Minn. Laws pp. 713–714, §8. This means, the County reasons, that Tyler has no property interest protected by the Takings Clause.
History and precedent say otherwise. The County had
