The 1210 Mass Apartments is a hidden gem of Washington, DC. Adjacent to Thomas Circle on Massachusetts Avenue, our residents are just steps away from all that the modern DC resident needs to live, play, work and thrive. 1210 Mass is a hidden gem in the heart of Washington, DC. This smoke-free community is located on Massachusetts Avenue and adjacent to Thomas Circle. Dining, entertainment and transit routes are only just steps from your front door. You'll be connected to some of the best theatres, restaurants, shopping, and museums the city has to offer. It's more than just another stylish, hip community. It's all waiting for you here at 1210 Mass Apartments.