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.