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A new rental tower is underway in Flemingdon Park, where Osmington Gerofsky Development Corporation (OGDC) and WJ Properties celebrated breaking ground this past Monday at 9 St Dennis Drive. Designed by architects—Alliance, the 38-storey building will introduce 474 rental homes, including 95 affordable units, with geothermal heating and cooling anchoring the first phase of a broader site redevelopment.
OGDC Principal and CEO David Gerofsky emphasized the investment and pace of housing delivery: “This groundbreaking reflects a substantial new investment in the neighbourhood. Designed to bring new housing options as quickly as possible.”
One-bedroom suites will account for all 95 affordable homes, representing 20% of the building’s rental supply. The development is supported by $185 million in federal financing through the Canada Mortgage and Housing Corporation’s Apartment Construction Loan Program.
The planned suite mix ranges from studios to three-bedroom homes, with two-bedroom layouts accounting for approximately 27% of the total, and three-bedrooms another 10%. This gives larger households rental options alongside the building’s more compact suites.
Don Valley West MP Robert Oliphant linked the funding to broader efforts to expand rental supply: “Our Government is committed to driving housing supply to bring housing costs down. Through the Apartment Construction Loan program, $185 million in federal funding toward 9 St Dennis project in Flemingdon Park will create more much-needed rental homes for the people living and working in Toronto. By working with partners in the private sector, we are helping deliver more homes, more quickly, and building stronger communities here in Toronto and across Canada.”
The redevelopment extends the Weinbaum family’s more than 60 years of ownership and management of the site through WJ Properties. Owner Allan Weinbaum said, “Since the late 1960s, our family has helped shape Flemingdon Park, building homes and caring for the people who live in them. This project is about investing in the neighbourhood's future: more rental housing, new public space, and a building that connects residents to transit and opportunities growing around them.”
The design takes its cue from Flemingdon Park’s existing landscape of apartment towers, as architects—Alliance Principal Peter Clewes explained: “At 9 St Dennis, we wanted to work with that original morphology of the area and evolve the Modernist idea of the ‘tower in the park’ for contemporary life. The building rises directly from a generous, contoured common landscape, maintaining the clarity and simplicity of the original planning idea while addressing the expectations of a new generation of residents. That idea is expressed in the building’s composition: a slender tower, wrapped in glass and precast concrete frames, sits elegantly on a black porcelain-clad base that folds up and over a glazed double-height atrium.”
With interiors by Ste. Marie, the building will offer residents coworking space, a fitness centre and sauna, a children’s room, and guest suites among its shared amenities. Additional shared facilities include a resident lounge, party room, workshop, and parcel storage, with 24-hour security also planned. Outdoors, a multi-use trail will complement the new park and pedestrian connections.
Below ground, 99 boreholes extending hundreds of feet deep will serve a geothermal exchange system designed to meet all of the building’s heating and cooling needs, along with 80% of its domestic hot water demand. The project team anticipates energy use 60% below that of a comparable code-built building, with greenhouse gas emissions reduced by 80%.
The future Flemingdon Park station on Ontario Line 3 will sit just across Don Mills Road, while Eglinton Line 5’s existing Don Valley station is approximately 600 metres away to the north. New pedestrian connections will accompany approximately 0.7 acres of public parkland to be conveyed to the City, expanding the neighbourhood’s outdoor space as transit access improves.
Beyond the site, the developers have invested over $800,000 in the community over two years. The nearby Flemingdon Park library branch has recently reopened following renovations funded by Osmington and WJ Properties. Their support also includes a two-year commitment to the library’s Financial Empowerment program, alongside annual grants of $25,000 each for a bike repair workshop and a sewing social enterprise.
Speaking at the September 28 groundbreaking, OGDC’s Laurie Payne highlighted the scope of these contributions: “9 St. Dennis is a remarkable project in many ways. But what is most important to OGDC is the community investments we are making that go well beyond what is required by the City. Thanks to the generosity of our partners, we have renovated the local library, funded local employment programs and granted 100 scholarships to local high school grads.”
The scholarship program has supported graduating students at Marc Garneau Collegiate Institute since 2025, with each recipient receiving $1,500.
Occupancy of 9 St Dennis is projected for 2029.
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