Towering Proposal Reworked Around Heritage Office Building at 10 St Mary

DEVELOPMENT PLANNING
April 7, 2025 By Anthony Teles 751

Revised on a high proposal in the Heritage office building in the 10 St. Mary

A revised proposal for the 10 St. Mary provides a 59-story mixed use in downtown Toronto in Bay Cloverhill. Architects-Alliang for Mattamy Homes was designed by Architects, and refines a protracted proposal that would protrude over a bound office building from the middle of the century.

View to the northwest to 10 St. Mary, designed by Architects – Alliang for Mattamy Homes

The development area extends over 10 St. Mary Street, 79–85 St. Nicholas Street and 710–718 Yonge Street. The site currently comprises an 8-story office building from Heritage alongside Niederhaus in various age groups with retail at street level and a mixture of commercial uses. The surrounding buildings include high-handed residential towers, office buildings and institutional facilities with retail and commercial shop fronts Yonge Street.

An aerial recording of the site and the surrounding area, picture of the submission to the city of Toronto

The proposal has developed significantly since a request for the recovery for the first time was submitted by a previous owner, lifelong developments, which wanted to tear down the existing office building and the OMB was filed in 2015. After Castlepoint RFT acquired the location in 2016 in 2016, a settlement was permitted in 2019, which was communicated in 2019 with a 51-story building with a 51-story building with a 51-story tok with a 4-story toke.

Previous design of 2021, 10 St. Mary, Toronto, designed by Architects – Alliance for Mattamy Homes

A submission to the approval of 2021 revised the plan to 50 floors (161.95 m without the mechanical penthouse) and 465 units, followed by a transmission of 2022 with 495 units and a height of 9 m. Units increased. The electricity consumption lowers the height to 59 floors and increases the number of units to 650.

Bousfields by redistribution of the application to approve the location plan to the city of Toronto on behalf of the developer increases the height to 197.29 m and now includes a rough floor area of ​​48.193 m². A significant increase of 41,650 m² in the presidents 2022 and 39,345 m² in the original 2019 plans. Of the current sum, 40,086 m² living space in the entire tower, 6,843 m² for office use within the retained building and 1,265 m² are dedicated to retail, mainly for the streets of Yonge and St. Nicholas. The floor surface index is now the 17.69 -fold cover of the location of 2,725 m², compared to 15.23 in 2021.

Previous podium design from 2021 by architects – Alliang for Mattamy Homes

West elevation of the podium

A previously planned boom over 10 St. Mary was removed, with the tower being returned by the South Lot line. The retained office building would be rehabilitated under the guidance of ERA architects with improvements in its lobby, external glazing and mosaic surfaces. Other inheritance elements in 79-85 St. Nicholas and 710-718 Yonge would also be preserved and restored.

Location plan designed by architects – Alliance for Mattamy Homes

The equipment area would include 1,310 m² indoors and 650 m² outdoors. Five residential elevators would lead to 130 units per elevator that require high -speed engines for an appropriate service. Below the class would take a three-story underground garage 94 vehicles, including 80 residential and 14 commercial space, a minor increase compared to the 91 rooms in 2023, but a reduction of 105 rooms in 2021. Bicycle parking spaces were expanded to 700 rooms, from 640 in 2023, with 612 long-term places and 88 short-term places.

Plan on the ground floor, which was designed by architects – Alliang for Mattamy houses

Three subway stations can be reached on foot: the Bloor-Yonge exchange station is 250 m in the north, a four-minute walk, while Bay and Wellesley stations are 450 m and 500 m away. There are committed cycle paths along the Wellesley Street and together allows along the Bloor between Church Street and the Avenue Road, although the Bloor Street Gleen are threatened by the province.

If you look northwest of the current website, the image of Google Maps was called

This is a growing group of high -rise development proposals in the region. In the west, the 25 St. Mary and 1075 Bay are both proposed on 59 floors. To the east of the location, the proposals 15 Charles East on 66 floors and 645 yon in 76 floors. Larger towers are planned in the north, including 50 Bloor West in 70 Storeys, 83 Bloor West at 77, and 80 Bloor West at 78, 699 YONGE are proposed on the 64 -Storeys, Cumberland Square, and one under construction is on 85 floors, while 19 Bloor West would reach 99 floors. South of the location, 619 and 646 Yonge are proposed in 70 and 75 floors. In the east, Charles rose to 47 floors in the church, and 88 and 90 Isabella are proposed with 62 and 69.

Urbantoronto will continue to pursue progress in this development. In the meantime, however, you can find out more about this from our database file linked below. If you want, you can join the conversation in the associated project forum thread or leave a comment in the room provided on this page.

* * *

Urbantoronto has a research service, UtPro, which delivers comprehensive data on development projects in the Greater Golden Horseshoe – from the proposal to completion. We also offer immediate reports, downloadable snapshots based on the location, and a daily subscription newsletter, New Development Insider, which pursues projects from the first application.