Markets & Investing, resources
Michelle Kam on the true cost of buying commercial property in Toronto
14 Sept 2026
The costs buyers don’t put in the budget
Most people pricing out a commercial purchase in Toronto start with the sale price and the mortgage rate. That is only part of the math. Land transfer tax, HST treatment, property tax reassessment, and the gap between closing day and the first paying tenant all add up, and they add up fast if nobody warns you in advance.
Michelle Kam is a real estate broker in Toronto who has spent years working across condos, resale homes, and commercial sales, and she has watched buyers get surprised by the same handful of costs over and over. Her view is that most of these surprises are avoidable. They just need to be priced in before an offer goes in, not after.
Land transfer tax and closing costs add up faster than expected
Toronto charges both a provincial and a municipal land transfer tax, and commercial properties do not get the first time buyer rebates that help residential purchasers offset that hit. On a mid-size commercial building, that combined tax can run into six figures before a single renovation dollar is spent.
Legal fees, title insurance, and a Phase One environmental assessment are standard on commercial deals and rarely optional. Buyers coming from residential purchases sometimes treat these as afterthoughts. Kam’s approach is to walk clients through every line item before they make an offer, not after they are already committed to a closing date.
HST is not always what people assume
HST treatment on commercial property depends on the use of the building, whether it is vacant, tenanted, or being converted, and whether the buyer is registered for HST. Getting this wrong can mean a buyer owes tax they did not budget for, or misses a rebate they were entitled to claim. This is one area where a mistake is expensive and hard to unwind after closing.
The vacancy gap: what it costs to sit empty
A cost that catches buyers off guard is the vacancy gap: the stretch of time between closing and the day a tenant starts paying rent. Even a well-located property can sit empty for months while a buyer sources a tenant, negotiates a lease, and waits for the tenant to finish their own buildout.
During that gap, the buyer is still paying the mortgage, the property tax, insurance, and any shared building costs. Kam tells clients to model at least three to six months of carrying costs into their purchase budget, even for properties that look easy to lease. Underestimating this gap is one of the more common reasons a commercial purchase feels more expensive than it looked on paper.
Renovation and buildout costs shift depending on the tenant
The cost of preparing a space also depends heavily on who ends up in it. A retail tenant, an office tenant, and a medical or restaurant tenant all need different electrical, plumbing, and ventilation work. Buyers who purchase a property with a specific use in mind should confirm that the space can support that use before closing, because retrofitting after the fact is far more expensive than confirming capacity up front.
Property tax reassessment after a sale
Commercial properties in Ontario are frequently reassessed after a change in ownership, and a new assessed value can mean a meaningfully higher property tax bill than what the previous owner paid. Buyers who base their pro forma on the seller’s old tax bill can end up short within the first year of ownership.
Kam recommends buyers ask their lawyer or accountant to estimate a post-sale assessment before finalizing a purchase, rather than assuming the tax line will stay flat. It is a small step that avoids a real gap in year-one cash flow.
What actually reduces cost over time
None of this means commercial purchases are a bad idea. It means the true cost of ownership is spread across more categories than the purchase price suggests, and buyers who plan for that spread tend to come out ahead.
A few things consistently help:
- Get a firm HST determination in writing before closing, not a verbal assumption.
- Build a carrying cost reserve that covers at least three months of vacancy, more if the space needs significant buildout.
- Ask for a post-sale property tax estimate rather than relying on the current bill.
- Confirm the space can physically support the intended tenant use before signing anything.
Kam’s broader point is that commercial buyers who treat the purchase price as the whole cost are the ones who get caught off guard. The buyers who do well are the ones who ask about the categories nobody mentions at the open house: taxes, vacancy, and the buildout nobody budgeted for until it was due.
