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A woman survived a robbery and sexual assault in her own Brooklyn apartment building's lobby, police said Saturday.

But cops are still on the hunt for the man who attacked her on Oct. 15.

RELATED: Suspect follows Bushwick woman into apartment, tries to rape her: NYPD 

Authorities said the unidentified man followed the 22-year-old woman as she walked into her apartment building on Evergreen Avenue at around midnight.

That's when the man brandished a kitchen knife and forced the woman onto the building's fourth-floor landing.

RELATED: VIDEO: NYPD seeks potential witness in deadly Bushwick beating 

The woman handed the assailant her pocketbook before he force dyer to commit a sex act on him at knife point, investigators said.

The man then ran away from the scene and the woman called police. She was taken to a local hospital for treatment and released promptly after.

Officials described the suspect as a black man in his mid to late 20s, around 6 feet tall and weighing about 180 pounds.

A police sketch of the suspect showed him wearing a dark baseball cap.

NYPD asks that anyone with information in regards to this incident call the NYPD's Crime Stoppers Hotline at 800-577-TIPS or text tips to 274637 (CRIMES) then enter TIP577.