It happened at a 16-story building on Riverdale Avenue around 9:15 a.m.
The fire destroyed several balconies and forced residents to evacuate the building.
Officials believe the fire started on a balcony or near one on the sixth floor and then jumped floors via the balconies.
The flames got into a few units that had windows open. In all, about 10-12 units out of 240 were impacted by the fire.
No injuries were reported but a shelter has been set up for residents while authorities assess which apartments are safe to return to.
The exact cause of the fire is under investigation.
----------
* More Hudson Valley news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Download our connected TV app