A unit believed to be occupied by squatters is being investigated as a place of interest in the alleged sexual assault of a Melbourne woman last year.A 30-year-old woman from Reservoir in the city's north was dropped off near her house by a rideshare driver on December 4, before she lost consciousness before 2am.When she woke up, she found herself inside a unit on Strathmerton Street, where she found a man allegedly sexually assaulting her.