11. Transwestern
| Address | 1900 West Loop South, Ste. 1300 |
| City | Houston |
| State | TX |
| Zip | 77027 |
| Web Site | www.transwestern.net |
| Phone | 713.270.7700 |
| Officers | Robert D. Duncan, Chairman; Larry P. Heard, President & CEO; Mark Doran, COO |
| Third-Party Space Managed | 211,323,560 |
| Owned Spaced Managed | |
| Total Space Managed | 211,323,560 |