A former Department of National Defence (DND) building at 110 O’Connor Street in downtown Ottawa is being demolished to make way for a new residential high-rise. The 14-storey building, dating from the early 1970s, was bought by Groupe Mach for $40 million in 2021 and will be replaced by a structure containing up to 400 rental units.
Former DND building being demolished in downtown Ottawa for new high-rise
Ottawa
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TL;DR: Key points with love ❤️A former Department of National Defence (DND) building at 110 O’Connor Street in downtown Ottawa is being demolished to make way for a new residential high-rise. The 14-storey building, dating from the early 1970s, was bought by Groupe Mach for $40 million in 2021 and will be replaced by a structure containing up to 400 rental units.
- 1 Early 1970s: Building constructed
- 2 2021: Groupe Mach buys building for $40 million
- 3 2025-06-16: Demolition in progress
- Former DND building removed
- New residential high-rise with up to 400 rental units will be built
What: Demolition of a former Department of National Defence building to be replaced by a residential high-rise.
When: Demolition is in progress (as of 2025-06-16). Building bought in 2021.
Where: 110 O’Connor Street, at the corner of Slater St. and O’Connor St., downtown Ottawa.
Why: To redevelop the site with a new residential high-rise containing rental units.
How: The 14-storey building is being demolished floor by floor.