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Crime scene investigators were gathering evidence inside an apartment at 435 East 65 Street.
On the fourth floor, an 89-year-old man had his hands tied behind his back and his head beaten.
"It's always surprising when these things happen, but this is New York City and it happens," Ken Fields said.
Police sources tell Eyewitness News there were no signs of forced entry and the elderly victim's apartment was not ransacked.
The full-service building between First and York has 24 hour doorman service, leading some residents to wonder if the victim knew his killer.
"If someone comes to visit me, they will call me from downstairs," Anna Valla said.
The name of the victim was not immediately released.
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