The New York City Police Department released surveillance showing the assailant following his 37-year-old victim into a Williamsburg building near Driggs Avenue and South Eighth Street around 8:30 a.m.
He stopped the woman in the stairwell and forcibly removed her pants and underwear.
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When the victim screamed and began to fight, the predator ran away.
The man police are looking for is described as in his mid-20s, 5 feet 7 inches to 5 feet 8 inches and 150 to 170 pounds. He was last seen wearing a green hooded sweater, light colored pants and black sneakers. He was carrying a black umbrella.
Anyone with information on the case is asked to call 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782).