| Business | Phone |
| Celtic Janitorial & Building 13010 Sierra Vista Dr, Lake Oswego 97035 | (503) 636-2529 |
| Celtic Janitorial & Building 356 N State St, Lake Oswego 97034 | (503) 636-2529 |
| Cleaning Services Inc Po Box 2112, Lake Oswego 97035 | (503) 635-7272 |
| Willamette Building Mntnc Inc 5 Bernini Ct, Lake Oswego 97035 | (503) 452-2231 |
| Skyline Building Maintenance 17446 Boones Ferry Rd, Lake Oswego 97035 | (503) 635-1940 |