If you walk into the throat of the building, up the steps, and through the front door you are on the 1st floor. Above that are floors 2 through 5. The street/sidewalk level is the "ground floor" or basement. As an officer (retired) working in that area and having fires in those buildings, my description would be 5 story MD. If I entered he building through the front door, walked up one flight of stairs, and called for a line, I would say
"start a line 2nd floor". The building has a store on the ground floor, the Walton Ave side. I had a fire (similar building) and my description was "5 story MD, fire in a store on the ground floor". The area from 169 st to 170 st between the Concourse and Jerome Ave, East Clarke Pl, Marcy Pl, and Elliot Pl was and still is a busy area for fires.