20. Mack-Cali Realty
| Address | 343 Thornall St. |
| City | Edison |
| State | NJ |
| Zip | 08837 |
| Website | www.mack-cali.com |
| Phone | 732.590.1000 |
| Officers | Mitchell E. Hersh, President and Chief Executive Officer; Anthony Krug, Chief Financial Officer |
| Office Space Developed | 237,856 |