Westmount Collegiate Institute

The community centre, which is attached to the northern edge of the school, contains an arena, a split gymnasium, and recreational rooms used for different events and programs, such as playing bridge. Rosemount also hosts various summer camps and programs, such as summer stock. The name of the community centre was created by merging the names of two nearby elementary schools and subdivisions, Rosedale and Westmount. The school is given access to the gym and arena throughout the years, such as for the school's hockey team.[3]

Adjoining Westmount from the southern portion of the complex, the City Playhouse is a 386-seat, community-based theatre featuring a wide variety of professional, community and school productions. It also serves the community as a rental house, particularly during the offseason months of May–September. The box office is on the south side of the theatre adjacent to New Westminster Drive. Similar to the community centre, the high school is given access to the theatre for use in assemblies, Westmount drama productions as well as other theatrical shows and the bi-annual musical productions, Springfest and Winterfest.[3] Known productions to frequent the theatre include but are not limited to City Youth Players, Starbeat, Characters, Judy & David, and even the in-house City Playhouse Productions. Marquee Productions was also a major company to produce shows for the theatre, among others in the Greater Toronto Area, but are no longer producing for the City Playhouse theatre having finished their last projects there in April 2012.

Attached to the west side of the complex, the Butternut Child Centre is a preschool which exists for children aged four and younger. There has been a mutual relationship between this nursery's daily functions and Westmount's student body, such as the observation of daycare kids by students taking Human Growth and Development and likewise, the kids being walked around the school during operating hours.