Living at Annex on 12th
SW Washington DC
![A refined coworking space at Annex on 12th with a central light-wood table surrounded by chairs, semi-private green-upholstered booths along both sides, and a ceiling featuring a gold-accented map design. Patterned carpet adds texture, and glass doors at the far end lead into an adjoining room with additional seating.]()
A Refined Coworking Space + Conference Rooms
Sleek wood, cozy alcoves, and a gold-detailed ceiling create a stylish, functional space for work or meetings.
![Spacious fitness center at Annex on 12th with high ceilings, wood-accented lighting, and separate zones featuring Technogym bikes, rowing machines, and strength equipment.]()
A Modern Fitness Center for Every Routine
High-end equipment meets inspiring, light-filled views in the gym.
![A sleek spin studio at Annex on 12th with three ICG stationary bikes, a wall-mounted TV, wood-paneled storage, and a slatted wood ceiling with recessed lighting. Large windows bring in natural light and views of the building’s brick exterior.]()
Dedicated Spin Studio & Yoga Space
A sunlit and serene studio for energizing, uplifting workouts.
![Open-air courtyard at Annex on 12th with modern lounge seating, fire pits, and brick walls surrounding the historic building.]()
Courtyard Calm and Outdoor Dining
Outdoor lounge seating, fire features, and grilling areas, all framed by historic brick
![Rooftop lap pool at Annex on 12th with sun loungers and glass railing, overlooking downtown DC and the Washington Monument.]()
A Rooftop Pool Deck with a Monumental View
The pool deck frames the city in a way that few other buildings in DC can match.
![Wide view of The Vault speakeasy’s main lounge, featuring the original barrel-vaulted skylight, red velvet seating, and gray swivel chairs arranged under warm ambient lighting.]()
Welcome to the Vault: Our Resident Speakeasy
This modern speakeasy pays tribute to the building's origins with striking architectural and design details like the original ceiling-spanning, barrel-vaulted skylight.
![Annex on 12th, an adaptive reuse project in Southwest DC, featuring a historic brick façade integrated with a modern glass addition. The building stands on a corner with wide crosswalks, traffic lights, and clear blue skies, highlighting its transformation from a federal building into a contemporary mixed-use space.]()
Annex on 12th Wins Best Conversion Award
Annex on 12th has earned the Best Conversion Award in the Washington Business Journal’s 2024 Best Real Estate Deals
![Exterior image of Annex on 12th - adaptive reuse of the Cotton Annex building in Southwest Washington DC]()
Annex on 12th is LEED Gold Certified!
Annex is proud to be LEED certified.
![historic exterior of annex on 12th plus an image of newly transformed luxe interior lobby]()
Yahoo! News on Reimagined DC Federal Buildings
Transforming prime real estate into community assets breathes new life into the heart of the nation’s capital.
![apartment living room at annex on 12th w floor to ceiling windows and view of Washington monument]()
Bisnow on Trending Adaptive Reuse in Southwest DC
Annex on 12th is putting visionary adaptive reuse into action, breathing new life into historic federal buildings in Southwest DC.
