At 2233 hours, Box 52-41 alerted Engines 52, 13, 8 (RIT), 20, 36, Trucks 16, 10, Battalion Chiefs 3, 6 to the 2700 blk of Pennsylvania Avenue for the report of a dwelling fire. Communications also received 2730 Pennsylvania Avenue. Engine 29 cleared a run in the area and was added to the box. Engine 52 hit the hydrant at Fulton & Pennsylvania and reported a 2 story, middle of the group, with smoke showing. Engine 29 stretched to the rear. Battalion Chief 3 arrived, assumed incident command, and advised of a 2 story, MOG, appears to be vacant, with fire showing from the second floor. 2 lines stretched from Engine 52 made the knock on the fire and contained to the second floor with no extension. Air Flex 1 dispatched at 2240 hours. The fire was placed under control at 2304 hours.