The buildings and the hardware
The mix of housing and buildings in Old City affects the hardware you find on site. Many apartment and rowhouse doors still use solid wood stiles and full mortise locks, which require different parts and deeper casework than modern bored cylindrical locks. Storefronts and commercial entries often have rim or commercial-grade mortise locks and metal frames, plus glass doors that need surface-mounted closers and panic hardware. Older doors can be warped, sticking at the latch, or have out-of-spec backset and strike placement, so a simple lock swap may call for routing, new strikes, or conversion kits to make new hardware work reliably.