Sahar Daftary, 23, from London, fell from the 12th storey of the NV Buildings on Salford Quays, Greater Manchester, at around 10pm on Saturday.
The former Face of Asia winner is understood to have been to the flat to collect her belongings after her relationship broke down with her boyfriend over the summer. He was arrested and has been bailed until February 13.
A spokesman for Greater Manchester Police told Sky News Online: "Inquiries are ongoing to establish the circumstances of the incident." Ms Daftary was also in Manchester to appear on the catwalk at a fashion show at an Indian restaurant on Saturday evening - but cancelled at the last minute saying she was sick.
A friend said Ms Daftary had the "world at her feet" but was unhappy after her love-split.
A resident at the waterfront block said: "We were out for the evening and there were a couple of police vans at the front of the building. The police said a young woman had fallen from the 12th floor."