Building B is a three-storey, approximately 56,000-square-foot office building constructed between 1966 and 1975. It is a restrained example of late modern architecture, characterized by a balanced composition of poured-in-place and precast concrete. The principal east and west façades are organized by a strong structural grid, with horizontal window openings and precast panels whose sloped upper edges introduce subtle depth and shadow. Its largely open floor plates are organized around a central elevator core, while stairwells pulled away from the main office volume provide distinct visual terminations at either end.

Within the larger CMHC campus, Building B is deliberately subordinate to the adjacent, symmetrical Building A. Its modest height, scale and placement reinforce Building A’s primacy while contributing to a coherent ensemble of related concrete buildings. The entrance to Building B is positioned north of the main office volume, associated with the north stairwell and the connecting gap or link to Building A. Historically, a circular drop-off further emphasized this point of arrival and strengthened the functional relationship between the two buildings.

Landscape is integral to Building B’s setting, particularly along its west and south sides, where lawns and mature plantings soften the building’s concrete geometry and mediate its relationship with adjacent parking areas. The land east of the building, now used for parking, was originally lawn, giving the building a more generous landscaped foreground. The west landscape, introduced in the late 1980s or early 1990s, was initially more clearly geometric; as the vegetation has matured, it has created a denser and more naturalistic setting around this quiet, carefully considered architectural composition.

As of September 2026, Building B is empty.