NBC New York reports that the two workers have been secured using ropes, and emergency workers are trying to find a way of winching them to safety.
Parts of the streets below, on 57th and 58th streets and Eighth Avenue, have been closed off.
More top news
Newly-unveiled UK Plastics Pact ‘unites every body, business and organisation with a will to act on plastic pollution’.
“Closing the door to the world will not stop the evolution of the world”, Mr Macron told US Congress.
Michael Seed is due to enter pleas over his alleged role in the infamous Hatton Garden heist at Woolwich Crown Court.