Column
From Office Towers to Condos: The Great Downtown Transformation
Jean Giguère
Author :
WikiResidence
Source :
1/5/26
As remote work redefines the urban landscape, Montreal faces a paradox: empty office towers and an acute housing crisis.
Groupe Mach, a real estate giant, is launching an offensive to transform its surplus assets into residential units.
An analysis of a major trend that could save downtown from devitalization, the costs involved, and the social impacts of this metamorphosis
Special Dossier: Montreal’s Urban Mutation
It is an equation that urban planners have been trying to solve since the end of the pandemic: how to fill the void left by workers while housing residents?
In Montreal, the answer lies in massive conversion. Groupe Mach, led by Vincent Chiara, recently confirmed its intention to tackle this colossal undertaking, but they are not the only ones.
1. Groupe Mach: A Strategic Shift
With a portfolio of over 40 million square feet, Groupe Mach is a market barometer.
The company is specifically targeting its Class B and C buildings—those often older, with less fenestration or less centrally located, which suffer the most from the desertion of commercial tenants.
The objective is twofold:
Reduce commercial vacancy: Vacancy rates in these categories are nearing 20 to 25% in certain sectors.
Create residential value: Transforming passive assets into rental housing, a market where the vacancy rate is below the critical 2% mark in Montreal.
Although the exact addresses remain strategic secrets, the group is analyzing several properties downtown and in Old Montreal to implement hundreds of new units.
2. Other Players and Flagship Projects in Greater Montreal
Groupe Mach is not alone in this race. Other developers and projects are redrawing the map of the metropolis:
Project / Developer | Location | Details and Impact |
600 De Maisonneuve Ouest | Downtown | Project to transform twin office towers into nearly 700 rental apartments. |
1001 Robert-Bourassa Blvd | Downtown | Ivanhoé Cambridge is constantly evaluating the mix of its assets to integrate residential uses into commercial hubs. |
Place Bonaventure Sector | Ville-Marie | Discussions are underway to reconvert adjacent office sections into hotels or residential units to revitalize the neighborhood. |
Old Port / Old Montreal | Historic | Several small heritage office buildings are being bought by private investors to be converted into luxury condos. |
3. Key Figures: Economy and Budgets
Conversion is not a cheap panacea. It is a complex and costly process.
Conversion Cost: Ideally estimated between $300 and $500 per square foot to transform office space into residential (seismic retrofitting, plumbing, fenestration).
Public Aid: The City of Montreal has implemented measures to accelerate these transformations, including a budget envelope aimed at supporting downtown revitalization, often coupled with provincial subsidies for affordable housing.
Fiscal Impact: For the city, an empty office is a potential loss of revenue.
Residential use ensures a stable tax base, although less lucrative per square foot than "prime" commercial space.
4. Social Impact: Towards the 15-Minute City
Beyond bricks and concrete, it is the soul of Montreal that is changing.
Social Mix: The arrival of permanent residents downtown breaks the "ghost town" cycle after 5:00 PM. This creates demand for grocery stores, daycares, and parks, rather than just business lunch restaurants.
Safety: A 24/7 human presence increases the sense of safety and natural surveillance of the streets (Jane Jacobs' concept of "eyes on the street").
Transport: These conversions, located near metro stations and the REM, favor a car-free lifestyle, reducing pressure on the road network.
Comparative Analysis of Subsidies and Financial Levers
The profitability of an office-to-residential conversion rarely relies on a single subsidy, but rather on a financing "cocktail."
The high cost of conversion ($300 - $500 / sq ft) makes purely private projects difficult to make profitable without the help of three major pillars: CMHC loan insurance (Federal), the PHAQ program (Provincial), and regulatory exemptions (Municipal).
1. Federal Lever: The Financing Engine (CMHC)
The federal government does not always offer "cash," but it provides the most powerful tools for capital structure.
Program | Type of Aid | Details and Impact |
APH Select (CMHC) | Loan Insurance (Leverage) | This is the #1 tool for developers. It is not a grant, but insurance allowing: • Financing up to 95% of value (LTV). • Amortization over 50 years (reducing monthly payments). • A debt coverage ratio reduced to 1.10. Condition: Integrate affordability, accessibility, or energy efficiency criteria (point system). |
GST Rebate | Tax Credit (Cash) | Major novelty: The federal government has removed the GST (5%) on new rental construction, including office conversions. For a $50M project, this represents a direct saving of $2.5M. |
Affordable Housing Fund | Loan / Contribution | Offers low-interest loans or non-repayable contributions. However, this fund is often oversubscribed and approval times can be long. |
2. Provincial Lever: Direct Aid (Quebec)
Quebec focuses mainly on the "affordable" aspect via the Société d'habitation du Québec (SHQ).
Program | Type of Aid | Details and Impact |
PHAQ (Quebec Affordable Housing Program) | Direct Subsidy | Replaces the old AccèsLogis program. It aims to cover part of the operating or construction deficit for affordable units. The developer must guarantee rents below market rates for a given period (often 15 to 35 years). |
QST Harmonization | Tax Credit | The Quebec government followed the federal lead to rebate the QST (9.975%) on new rental construction, a massive fiscal incentive when paired with the GST rebate. |
3. Municipal Lever: Regulatory Incentive (Montreal)
The City of Montreal uses its regulatory power to reduce developers' fixed costs.
Program | Type of Aid | Details and Impact |
By-law for a Diverse Metropolis (20-20-20) | Exemption (Savings) | Strategic: Normally, a developer must pay a financial contribution if they do not build social housing. To accelerate downtown conversions, Montreal has suspended this requirement for office conversion projects until the end of 2026. This is a saving of several million dollars per project. |
Affordable Metropolis Program | Subsidy | Targeted financial aid for projects that integrate a high social component, often managed in partnership with non-profits (OBNL). |
Analysis Verdict
For a conversion project to be viable in Montreal today, the winning strategy generally combines:
Using APH Select to maximize bank leverage (minimize down payment).
Recovering ~15% of construction costs via GST/QST rebates.
Locating downtown to benefit from the penalty exemption of the Mixed Metropolis By-law.
If the technical and financial challenges are immense, the cost of inaction—a deserted downtown—would be much higher.
We are witnessing the birth of a new Montreal: more hybrid, more inhabited, and hopefully, more alive.