Police released security footage from the building on East 111th Street and Second Avenue, where it happened Monday at around 11:30 p.m.

They say the suspect walked up behind the 64-year-old victim and put her in a chokehold until she was unconscious.

Police say the suspect then raped her before aking off on a Citi Bike.

She was found by neighbors and remains in a medically induced coma.

Anyone with any information is asked to call the NYPD’s Crime Stoppers hotline at 1-800-577-TIPS (8477), or for Spanish, 1-888-57-PISTA (74782). You can also submit a tip via their website or on Twitter, @NYPDTips. All calls are kept confidential.