The victim, a 33-year-old man, was taken to James Cook Hospital where he underwent surgery for a head injury. He remains in hospital in a stable condition.
A 43-year-old man was arrested on suspicion of assault and was interviewed and released on bail while enquiries continue.
Police would like to appeal for any witnesses to the assault in Tower House or anyone who may have CCTV of the victim leaving Tower House at 8.50pm to the point when he is picked up by ambulance on Middleton Road at 10pm.
If anyone has information about the incident please call 101 quoting reference number SE23008595. Or please upload footage here:
If you don’t want to speak to police, you can pass information anonymously to independent charity Crimestoppers online www.crimestoppers