| Business | Phone |
| Environmnent Dept 1800 Washington Blvd, Baltimore 21230 | (410) 537-3000 |
| Geological Survey 2300 Saint Paul St, Baltimore 21218 | (410) 554-5500 |
| Real Estate Commission 500 N Calvert St, Baltimore 21202 | (410) 230-6230 |
| Real Estate Office 300 W Preston St # 601, Baltimore 21201 | (410) 333-4720 |