In the past, land titles many white neighborhoods had "restrictive covenants" stating that the land could only be sold to another white person. This was meant to maintain property values, a reason the Supreme Court said was not good enough. [Eric Holder, Freedom Of Association, And The Forgotten Case For Restrictive Covenants, August 27, 2013]
The most destructive SCOTUS case (Shelley v. Kraemer, 1948) was based around three cases on restrictive covenants: one came from St. Louis.
The "Shelley House" is a National Historic Landmark.
Here's a black-and-white historical photograph.
Here's the house in roughly in 2011:
I looked on Google Maps/street view.... look at the house today (below).
This is... unbelievable.