When the Lime Grove subdivision in Key West was created in 1941, the legal document laying out the lots included some restrictions.
One of them says this: "No race or nationality, other than those of the Caucasian race, shall use or occupy any building or any lot." The restriction makes an exception for domestic servants.
The U.S. Supreme Court outlawed such discriminatory rules in 1948 and it has not been enforced. But it's still on the books.