The office building, also known as Tower 1, has 22 floors and stands 83 metres (272 ft) tall. The other office building has 2 floors and is known as the Tower 4 Pavilion; it was formerly the Eastern Airlines Building. The two residential towers each have 21 floors, and stand 69 metres (226 ft) tall.[9]
Westmount Square's shopping concourse houses boutiques and art galleries, with about one-third of the space reserved for private for-profit health clinics.[10]Skylights were installed on the roof of the shopping concourse in 1990, which led to criticism among architectural preservationists.[11]