I think there are a lot of Communication/ Communication Arts/ Media and Communication/ Communication Studies programs that have faculty researching what you're looking for. I recall seeing quite a few people while I was looking for programs in Communication. They may not specifically say urban space but will still be applicable.
Try UC San Diego and Yale as well. It was either Ohio University and/or Bowling Green State University that had a few professors doing urban space. University of Wisconsin-Madison Communication Arts probably would have someone as well. But at least in Communication, space itself is a pretty hot topic so it shouldn't be too difficult to find.
Also, a better approach would probably be to look at journal articles and books in your field that really interest you and look at where the writer is teaching/ got their Ph.D.
