C.D. Howe Building, Federal office tower near Parliament Hill, Ottawa, Canada

The C.D. Howe Building is an eleven-story office tower at Bank and Sparks Streets in Ottawa, built by Olympia and York and opened in 1978. Its lower three levels hold the 240 Sparks mall, with about 50 stores. Inside, two elevator banks with two-story-tall cars rise through an atrium running the full height of the building, beside a large waterfall and indoor greenery.

The building opened in 1978 after Olympia and York constructed it on federally leased land under an agreement that extended to 2012. This long-term lease arrangement shaped its role as a modern office complex near Parliament Hill for decades.

The building is named after C. D. Howe, a federal minister of the 1930s to 1950s. Its lower three levels hold the 240 Sparks mall, which had 50 stores including a Holt Renfrew outlet that closed in 2015. The two-storey elevator cars rise through an atrium spanning the full height of the tower.

The building sits at the corner of Bank Street and Sparks Street, with the 240 Sparks mall on its lower three floors. The two-storey elevator cars rise through an atrium running the full height of the tower, so allow time to find the right bank. Doors Open Ottawa opened the building to visitors in 2012 and 2014.

The rooftop is split between two green systems: over 30% is landscaped with indigenous flowers, grasses and shrubs, while another 30% uses green roof technology. Public Works and Government Services installed it for energy conservation, storm water management, biodiversity and air quality, and to give occupants a landscaped outdoor space.