There's good reason for all those schools, and I think it's worth noting that they all handle separate markets. Although big REITs are often national, a lot of the real estate industry is regionally focused.
USC and UCLA have all the southern California real estate firms, which, living in Oregon, I know are strong up and down the west coast for major developments and innovation. Haas has the Bay Area firms, which I also see a lot of around here.
Wisconsin has the Midwest market, largely to itself, in terms of a strong focus on real estate.
Wharton, Columbia, and Cornell are strong for New England. UNC has a great program for the South.
I was also reading on the BW forums posts from a graduated MBA who works in real estate. He emphasized that it is more important to get in to a great school than a school that emphasizes real estate. Of course, all the above are strong schools, so they should still be strong either way.