His injuries were sustained after two men became involved in an altercation outside La Cala nightclub at about 1 am.
The man fell into the window of the Ikon Studio opposite La Cala and was taken to hospital, where he had surgery for the serious back injury.
Although the man was in the intensive care unit for most of the weekend, his condition was described as stable today.
The police want to speak to anyone who witnessed the incident and, in particular, the second man involved in the dispute with the injured man.
He is described as being in his early twenties, about 5 ft 9 ins tall, of medium build with short light brown hair.
He was wearing jeans and a light coloured T-shirt with a dark zip-up top that possibly had a hood.