Khan beat a gaggle of up-and-coming practices to land the project which will see the overhaul of the existing centre for young homeless and vulnerable in the notorious north London area.
Originally set up by the RIBA competitions office as an open ideas contest, the judges were so impressed by the proposed scheme to revamp the listed building that it has been decided to take the project forward.
Among the competition jury was Channel 4 newscaster and New Horizon chair Jon Snow, who admitted he was now looking for financial backers to 'bring it off'.
Second and third place in the contest, which was supported by the John McAslan Family Trust, went to Shahid Hussain with Wai Piu Wong and Leith Kerr respectively.
The other runners up were Edward Park with Nick Silcock, M8 Creative Design and We Made That.