A Sydney man has been cleared of raping a teenager in the laneway outside his father's Kings Cross nightclub after a retrial.

Luke Andrew Lazarus, now 25, was sentenced in 2015 to at least three years' jail over the 2013 rape of an 18-year-old woman on her first night out in Kings Cross but his conviction was later quashed on appeal.

Luke Lazarus leaves the Downing Centre District Court on Thursday. Credit:AAP

Retrial judge Robyn Tupman on Thursday found him not guilty of anally raping the woman, who had alleged she was assaulted behind the Soho nightclub, partially owned by Mr Lazarus' father, Andrew.

"I have come to the determination that the Crown has not established that there were no reasonable grounds for believing the complainant was not consenting," Judge Tupman said before acquitting him.