The Edinburgh-based practice beat Malcolm Fraser Architects, Gareth Hoskins, 3D Design and Gordon Murray + Alan Dunlop Architects to scoop the Justice Mill Lanes contest.
Also shortlisted was Schmidt Hammer Lassen, the big-name Danish office that was recently appointed to design a new library for the University of Aberdeen.
The project, for developer North Invest, will see the construction of a mixed-use scheme made up of a third residential and a third office space. The remaining part of the project will be a hotel.
Perhaps surprisingly, the contest was organised by Brian Stewart, the former RMJM boss who rose to prominence after his work on the Scottish Parliament.