About a dozen years ago or so there was an excellent feature in the Washington Post describing how the firehouse at 731 R Street NW (formerly Engine Company 7 then Engine Company 4)had been converted into a private dwelling after Engine Company 4 was relocated to their new station on Sherman Avenue. The former quarters of Truck Company 4, originally Truck Company D, has been converted into a private gym doing business as Primal Fitness. I stopped in there last spring to tour the old place and sadly, there is very little left besides the bay doors that would identify the structure on the inside as a fire station.
Stay safe brothers.
Stay safe brothers.