Originally Posted by MSPeconomist

Waldorf Towers (NOT the Waldorf Astoria, the Waldorf Towers is a luxury hotel within a hotel with a completely separate entrance and small lobby, different staff, but connected to the WA lobby by an indoor passage), sort of old fashioned and residential, lots of big suites, I think the address is something like 51st and Park, close to the W on Lex

Royalton at 44 West 44th Street, not true luxury but interesting and stylish boutique hotel, modern design in a traditional building, good for people watching

These two would be good locations for what the OP seems to want