With so many residential high rises in New York competing for tenants, prospective residents need to weigh all the factors. Amenities abound in NYC real estate, from concierge services and pools to multi-story courtyards with breathtaking river views. But while trends and features in urban living come and go, one figure remains stalwart and sure. That figure, of course, is the doorman. Ubiquitous in films and tv shows about New York, uniformed and steady, the doorman is the embodiment of…