The site, located off Victoria Road in Headingley, is being redeveloped into 101 apartments and townhouses by Stonebridge Homes.
The £20m Victoria Gardens Scheme has been in the first stage of progress throughout the year, and the next phase will see Brewster Bye oversee architectural delivery as appointed by main contracter Henry Boot.
Project lead John Holliday from Brewster Bye said: “This second construction stage, which is now on-site, will see the careful restoration and redevelopment of the historic main school building into 36 luxury apartments.
“The school has many period features that are gradually being uncovered, including some beautiful brickwork arches, original windows and exposed beams, that once restored, will all combine to create a wonderful selection of stunningly unique and individual homes.
“Our role is to ensure that the majority of these features are incorporated into the architectural designs, as well as overseeing the architectural delivery of the project as a whole. The build is located just a short walk from our offices, so we are able to monitor how the development is progressing on a daily basis. “
The refurbishment of the school building is set to complete in autumn 2017 and the whole development will be completed by 2018.