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Mississauga's impressive skyline is shaping up taller than ever, as the structural work for the crown of M3, Canada’s tallest building outside Toronto, has now been completed. Designed by Arcadis for Rogers Real Estate Development and Urban Capital Property Group, the 77-storey condominium tower rises above Mississauga City Centre as the centrepiece of the M City development. Captured by drone in the image below, the 60-storey accordion-shaped M1 and M2 stand at right, M3 rises high under its crane, and 67-storey M4 and 36-storey M5 rise below their cranes. M6 (57 storeys), M7 and M8 (45 and 50 storeys) will complete the community in the future.
UrbanToronto’s last front page update was in October, 2025, as crews prepared for installation of the tuned mass damper, a suspended counterweight system that stabilizes this and other tall towers, keeping them from swaying noticeably in the wind. In December, 2025, the chamber holding the TMD was captured by drone again, the dark metal, compound object hulking under steel trusses from which it is suspended in the middle of the cavity seen below.
Looking to the crown in early June, 2026, M3’s peaked, skeletal roof structure was all but complete, with exposed steel rising above the completed concrete floors below. Multiple tiers of steel and cross-bracing form the terraced upper crown. The crane rises alongside the southeast elevation.
From grade, M3 stands with its unique silhouette complete. Its chamfered elevations and sawtooth pattern of alternating black and white balcony accents lead the eye toward the stepped mechanical crown. At the base, the six-storey podium features dark-framed glazing and spandrel panels, while a double-height amenity pavilion anchors the southeast corner with floor-to-ceiling curtainwall glazing projecting above the roofline.
This month, M3’s crown is partially enclosed behind glazing, dark spandrel panels, and white horizontal cladding bands. The multi-level steel skeleton remains partially visible. Below the sull opaque level, the three-storey concrete chamber housing the 705-tonne tuned mass damper is hidden, while the upper residential floors are also fully enclosed now. At the same time, the crane has begun the job of dismantling itself. Now lower than the peak, its hoisting system is being used to lower sections of the mast to the ground, one at a time, with its uppermost section reaffixing itself to the next lowest section.
With the partially enclosed mechanical crown virtually complete, M3's faceted elevations and stepped profile are now fully legible, complemented by alternating balcony treatments and glass guards. M3’s sculpted massing is now fully expressed, with a series of step-backs on its east side, and a projecting western corner close to the drone camera.
In this high-angle view, diagonal cross-bracing and steel framing span M3's stepped crown to support the architectural enclosure and rooftop mechanical systems, with the building maintenance unit in place in its cavity. Strips of blue weatherproofing remain exposed around portions of the lower roof levels, awaiting final cladding.
M3 at M City stands at 260.29m and will house 949 condominium units.
UrbanToronto will continue to follow progress on these developments, but in the meantime, you can learn more about them from our Database files, linked below. If you'd like, you can join in on the conversations in the associated Project Forum threads or leave a comment in the space provided on this page.
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UrbanToronto's research and data service, UTPro, provides comprehensive data on construction projects in the Greater Golden Horseshoe—from proposal through to completion. Other services include Instant Reports, downloadable snapshots based on location, and a daily subscription newsletter, New Development Insider, that tracks projects from initial application.
