4100 Fairfax Drive

Arlington

The Arlington County Board has signed off on plans to convert the 13-story office building at 4100 Fairfax Drive — home to Bronson Bierhall on the ground floor — into 296 residential units. The building footprint stays the same, but the structure will gain about 15 feet in height, rising from 170 to 185 feet, to accommodate a rooftop amenity space that will include a pool. Ground-floor retail and the building's 441 underground parking spaces are unaffected. Some commercial tenants will be allowed to remain through the end of their leases, with some potentially staying as late as 2029.