The incident happened at about 9:30 a.m. on East 93rd Street between First Avenue and Second Avenue on the city's Upper East Side.
Officials said the doorman fell through a glass window while shoveling snow. He sustained cuts to his neck and face, and was pronounced dead at the hospital.
He has been identified as 59-year-old Miguel Gonzalez.
"It's a reminder to be very careful when you're shoveling," NYC Mayor Bill de Blasio said. "If you're not up to shoveling, don't shovel. Take breaks - all of those common sense rules. We don't know what happened in this case - just want to remind people to take it seriously."
Here is video showing the scene where it happened:
Union president Hector Figueroa issued the following statement:
"We are deeply saddened by the loss of doorman and 32BJ member Miguel Gonzalez, who passed away this morning while shoveling snow at the building where he worked for many years. Our thoughts and prayers are with his wife and children and all those who knew and cared about him, including his coworkers and the residents of the building. Our union family will do all we can to support Miguel's family in this difficult time. Our thoughts and prayers also go out to all the members working hard to keep us safe during this blizzard and every day."