In this case there would be a clear motivation to exclude people of a certain race from living in your buildings. The ad content may be neutral, but the person

In this case there would be a clear motivation to exclude people of a certain race from living in your buildings. The ad content may be neutral, but the person performing the act of advertisement is racist. How about a newspaper ad that tells people to tell their white friends about some great housing? Technically those people down the chain are performing non-racist advertisements, but only to their white friends. You couldn't tell a bunch of people this, so why could you tell a newspaper staffer to do this?