Put aside for a moment the racist implications of the bylaws and consider just the legality of listing the house publicly: I think the league can legally preve

Put aside for a moment the racist implications of the bylaws and consider just the legality of listing the house publicly: I think the league can legally prevent the listing. They own the land on which the house stands. In cases like these the homeowners lease the land. I think it could be legal for a private community that owns its grounds to prevent someone from listing their house publicly. If the homeowners were able to pick their house up and move it off the land they would not have to abide by the terms of the lease anymore, but if it's written into the lease you are legally obligated to follow the terms. If your house is permanently there you are pretty much screwed. Of course, that is assuming that everything else is on the level and you aren't violating federal law with the terms of your lease (like only accepting people of German descent).