An 18-year-old man from Sheffield was arrested on suspicion of rape, and he remains in police custody.
A woman was allegedly raped at a property on Cuthbert Bank Road, in Hillsborough, during the early hours of Saturday, November 4.
She was reportedly approached outside the building by a stranger, who then followed her inside and attacked her.
The attack is believed to have taken place between aroudn 4.20am and 4.50am.
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Detectives are still investigating the alleged rape and have asked anyone with information to call 101, quoting incident number 305 of November 6.