This unit is located at 301 Massachusetts Avenue, NW. The listing says:
“Boutique Luxury Building located in Mount Vernon Square across from Capitol Crossing. This pristine modern 2BR 2BA corner unit offers unique floor to ceiling rounded windows and exposed duct work throughout the 1,400 sq. ft. of interior space. The Sonata offers a concierge, gym, and an expansive shared roof deck with views of the Capitol Dome and Washington Monument. 1 Garage Space, In unit W/D”
You can see more photos here.
This 1410 sq. ft. 2 bed/2 bath is going for $765,000 ($873 monthly fee.)