4. Colliers International
| Address | 601 Union St. Ste. 4800 |
| City | Seattle |
| State | WA |
| Zip | 98101 |
| Web Site | www.colliers.com |
| Phone | 206.695.4200 |
| Officers | Doug Frye, Global President & CEO; Peter Humphries, CFO & COO; Dylan Taylor CEO | Americas |
| Third-Party Space Managed | 1,120,000,000 |
| Owned Spaced Managed | |
| Total Space Managed | 1,120,000,000 |