42 U.S.C. § 3615
Effect on State laws
Nothing in this subchapter shall be construed to invalidate or limit any law of a State or political subdivision of a State, or of any other jurisdiction in which this subchapter shall be effective, that grants, guarantees, or protects the same rights as are granted by this subchapter; but any law of a State, a political subdivision, or other such jurisdiction that purports to require or permit any action that would be a discriminatory housing practice under this subchapter shall to that extent be invalid.
( Pub. L. 90–284, title VIII, § 816 , formerly § 815, Apr. 11, 1968 , 82 Stat. 89 ; renumbered § 816, Pub. L. 100–430, § 8(1) , Sept. 13, 1988 , 102 Stat. 1625 .)