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TRIBECA, Manhattan — A building partially collapsed in Lower Manhattan early Friday, forcing evacuations.

The front half of the roof of 21 Park Pl. collapsed at about 3:30 a.m., falling onto the floor below, causing a progressive “pancaking collapse” before stopping at the cellar level, the Department of Buildings said.

The building will undergo a full demolition under the supervision of D.O.B engineers. Demolition could start as early as Friday afternoon.

Officials said there are no preliminary signs that the structural stability of any of the neighboring buildings was affected, but the department will continue to monitor the situation.

Two neighboring buildings — a five-story mixed-use building at 23 Park Pl. and a 21-story vacant new building construction — were vacated as demolition is underway.

A total of three families were displaced early Friday following the collapse, according to the Red Cross.

There were no injuries reported.

Park Place is closed in both directions between Church Street and Broadway. Drivers are advised to consider alternate routes.

The Department of Buildings is investigating the incident.