William Kestin, MD

William Kestin, MD, practices in interior Manhattan at the Madison Avenue Medical Arcade on the 4th floor—one of those red-brick pre-war buildings with polished brass that quietly announces serious work gets done here. Uptown clinics often carry a wait, but this office stays lean. You won’t find a concierge, but the sign on the door reads honestly: Doctor, then the name below. An exact street address holds power: 635 Madison Ave 4th floor, New York, NY 10022. Take your time hunting for the freight elevator; once you step out on the fourth floor, the door is already labeled. Noise from Madison drifts up through the vents, but once you pass entry it quiets. They keep restroom facilities on-site, which some uptown suites overlook. This corner of Fifth-to-Madison can feel like parallel worlds: behind one facade sits a landmark boutique hotel, two doors down an art dealer’s space. Yet the 635th building is strictly clinical—glass and wood-paneled directory, frosted glass on either side. William Kestin, MD clears patients in, clears them out, then clears the slate for the next. No side rooms for extras, no bells or whistles. Put the address into the map once: See the turn-by-turn route on Google Maps. With your bearings set, dial (212) 858-9005 before arrival. The line reduces wait times.