"Jose Noel Medina, far left, the superintendent of a building in Chelsea, and Dan Nainan, a resident, have attended a concert together. Mr. Nainan routinely invites members of the building staff to his parties. ""I tend to be friendly with everyone,"" Mr. Nainan said. ""I'm friendly with my neighbors and walk their dogs, and I'm friendly with the doormen and fix their computers and don't charge them."""
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