By John Annese | New York Daily News (TNS)

A pane of glass plummeted more than 400 feet from a Midtown skyscraper, crashing down onto the sidewalk and street below early Sunday morning, city officials said.

The 4-foot-by-6-foot pane fell from 1345 Sixth Ave., a 50-story, 2 million-square-foot tower at W. 54th St., around 7 a.m., according to the city’s Department of Buildings.

No one was injured by the glass, though police blocked off the sidewalk as first responders gathered.

The building’s 43rd floor, from which the glass fell, is undergoing alteration work, Buildings officials said. The floor was previously damaged during construction on Friday, those officials said.

Contractors are currently working to seal up the floor, and DOB has issued a violation to general contractor J

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