Nothing unusual in the front view.
Never seen a building where the interior was narrower than the fire escape. Looks too narrow to be a Railroad Apartment, which is a series of connected rooms in a line served by a hallway running the length of the space much like a railroad car with individual compartments. To my knowledge that only leaves Shotgun House. Shotgun houses are the same as Railroad Apartments but without the hallway, so access to any room is only from the one next to it and exterior doors at both ends.
Sample Shotgun House floor plan.