Capstone is another developer.
http://www.capstonecompanies.com/
The houses at Southeastern Louisiana are actually townhouses. Organizations had a choice in the size of their unit. The choices were 22-bed, 15-bed and 11-bed units, each with its own large meeting room and kitchen facilities. Each two-bedroom has its own full bath. All of the sororities are 22-bed.
The University of South Alabama has nice units too but I forgot who developed them.
http://www.southalabama.edu/housing/greek.html