How Much Is My Commercial Property Worth in Ontario? A Practical Owner’s Worksheet

A first estimate of what a commercial property is worth in Ontario can be built in about an hour from four inputs: the income the property actually collects, the expenses the owner actually pays, a realistic cap rate range, and a few adjustments for things the income figure does not capture. This worksheet is for owners who want a working range before they speak with a broker or appraiser. It will not replace a formal valuation, but it will show you how sensitive the number is to each assumption, which is the most useful thing to know before you set an asking price. For the underlying theory, read what drives commercial property value in Ontario.

Step 1: Build Effective Gross Income from the Leases

Start with the rent roll, not the asking rents in the listings nearby. For each tenant, list contract rent, lease expiry, renewal options and any rent-free periods still to run. Add recoveries from tenants (such as common area maintenance, property taxes and insurance) that the leases actually allow you to collect. Then deduct a realistic allowance for vacancy and non-payment. If a large tenant’s lease expires within the next couple of years, be honest about whether the space will be renewed, re-let at a different rent, or sit empty.

Step 2: Deduct the Operating Expenses You Really Pay

Net operating income (NOI) is effective gross income less operating expenses, before mortgage payments and income tax. Use actual figures from your statements: property taxes, insurance, utilities, repairs and maintenance, management, and any non-recoverable costs. Two common errors inflate NOI and therefore value: leaving out a management fee because the owner manages the property personally, and ignoring reserves for roofs, paving or mechanical systems. Buyers will adjust for both. Our guide to calculating NOI lists what to include and exclude.

Step 3: Choose a Range of Cap Rates, Not a Single Number

The capitalization rate is the return buyers require for a property like yours, expressed as NOI divided by price. It depends on property type, location, tenant strength, lease length, condition and prevailing financing conditions. Rather than picking one figure, choose a low, middle and high case, and support each with evidence such as recent sales of similar properties, ideally verified by a broker or appraiser who has seen the transactions. Do not use a cap rate you saw in a headline for a different asset class or city. See what a cap rate is and how it is used.

Step 4: Run the Numbers

Here is an arithmetic illustration only. The figures below are hypothetical and are not market data.

The same NOI produces a range of roughly $1.2 million across a one-point spread in cap rate. That sensitivity is why supportable evidence for the cap rate matters more than the arithmetic.

Step 5: Make the Adjustments the Formula Misses

• Deferred capital: a roof or parking lot near the end of its life reduces what a buyer will pay.
• Below-market or above-market leases: a lease running well below market rent may be a source of upside, or a limit on it, depending on term.
• Excess land or redevelopment potential: some properties are worth more for what could be built than for what is there.
• Environmental or zoning issues: these can reduce price or the number of buyers who can proceed.

Step 6: Cross-Check Against Other Evidence

Compare your indicated value with price per square foot (or per suite, for multi-residential) from recent comparable sales, and consider what it would cost to build a similar property. If the approaches point in very different directions, find out why before you rely on any of them. Also remember that the assessed value on your Ontario property tax bill is not a market value: MPAC’s 2026 assessments continue to be based on January 1, 2016 values.

When to Move from a Worksheet to a Professional Valuation

Use a formal appraisal or a broker’s opinion of value when the decision is large, contested or regulated: a sale, a refinancing, an estate, a partnership buyout or a tax dispute. See commercial property valuation methods for how the professional approaches differ.

Frequently Asked Questions

Can I use my property tax assessment as my property’s value?

No. MPAC assessments are used for taxation and currently reflect January 1, 2016 values, not today’s market.

What cap rate should I use?

One supported by recent sales of comparable properties in your market, ideally as a range. Avoid borrowing a rate from a different property type or region.

Does the value change if a tenant leaves?

Usually yes. Income, risk and the time and cost to re-lease the space all change, and buyers will adjust the price accordingly.

How accurate is a worksheet estimate?

It is only as good as the income and expense data and the cap rate evidence behind it. Treat it as a working range, not a price.

Conclusion

Estimating what your commercial property is worth means building income from the leases, deducting real expenses, testing a range of cap rates and adjusting for capital, lease and site factors. Doing the exercise yourself shows which assumptions matter most and makes your conversation with a broker or appraiser more productive. If you would like a property-specific view, CapRate.ca provides valuations for owners in the GTA and Southern Ontario.

Sources and Further Reading

• Municipal Property Assessment Corporation: The Assessment Cycle
• Government of Ontario: Calculating land transfer tax

The figures in the tables are hypothetical illustrations, not market data or an appraisal. This article is general information and is not legal, tax or accounting advice.