Living at Annex on 12th
SW Washington DC
![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.
![Art Deco exterior of the cotton annex next to a new image outdoor pool deck and addition to the re-imagined historic dc property]()
Business Insider Highlights DC Redevelopment
Business Insider highlights how Annex on 12th is a standout example of DC's booming trend of turning old offices into beautiful modern apartments.
![resident lounge with green velvet couches, double-height ceiling, plush area rugs, Art Deco chandelier, floor-to-ceiling windows, comfy boucle cream arm chairs]()
One-of-a-Kind Luxury Amenities
Explore a truly original and considered lineup of building amenities that feel like extensions of a boutique hotel.
![annex apartments lobby with high ceilings, tons of seating areas with couches and chairs, floor to ceiling windows, fireplace, and more.]()
In The News: Multifamily Executive, BisNow & Axios
Recent press for Annex on 12th's new development in Southwest DC includes mentions from Multifamily Executive, Axios, and Bisnow.
![side view of renovated annex on 12th building with original tall windows and facade and US Department of Agriculture lettering]()
DC's Cotton Annex Building: From Past to Present
Explore the history and architecture of the Cotton Annex building, from its 1930s origins with the USDA to its new era with Annex on 12th.
