Man found dead in Perth alleyway

A 20-year-old man found dead in an alleyway in Perth's entertainment district may have fallen from a nearby building, police say.

The man had been visiting the inner city suburb of Northbridge with friends and parted company with the group at around 4.30am on Sunday.

His friends became worried when they could not contact him and searched the area, finding him in an alleyway off Aberdeen Street around 8pm that night.