A client called me a few years back, genuinely confused. He’d had his small office building in North York appraised twice within the same year, once for refinancing and once for a potential sale, and the two numbers came back almost $300,000 apart.
“How can the same building be worth two different things six months apart?” he asked.
It’s a fair question, and the honest answer is that commercial valuation isn’t a single calculation. It’s a methodology choice, and that choice depends on the property, the purpose of the report, and the data available at the time. Once you understand how the three core approaches actually work and when each one applies, that $300,000 gap stops looking like a mystery and starts looking like exactly what it was: two appraisers answering slightly different questions.
After spending most of my career valuing commercial real estate across Toronto and the GTA, I want to walk through how this actually works, because investors and lenders who understand the mechanics make better decisions and ask sharper questions when a report lands on their desk.
The Three Approaches, and Why None of Them Stands Alone
Every commercial appraisal in Ontario draws from up to three recognized methods: the income approach, the sales comparison approach, and the cost approach. Most properties get valued using a combination, with one approach carrying more weight depending on the asset type.
The income approach asks a simple question: how much money does this property generate, and what would an investor pay for that income stream? You take the net operating income, the revenue left after operating expenses but before debt service, and divide it by a capitalization rate appropriate for that property type and submarket. A retail plaza generating $280,000 in net operating income at a 6% cap rate is worth roughly $4.67 million. Change the cap rate to 6.5%, and the same income stream is suddenly worth about $4.3 million.
This is the dominant approach for income-producing assets: retail plazas, office buildings, multi-tenant industrial, apartment buildings. The income approach is also the most sensitive to assumptions. Small changes in cap rate or vacancy assumptions move the final number significantly, which is exactly why lenders scrutinize how that NOI was calculated.
The sales comparison approach looks at what similar properties actually sold for and adjusts for differences in size, location, condition, and timing. This approach works well when there’s a healthy volume of comparable transactions, which is often the case for smaller commercial condos, standalone retail buildings, and certain industrial properties.
The challenge in the GTA is that “comparable” is doing a lot of work in that sentence. A 15,000 square foot industrial building near Pearson doesn’t behave like a similar-sized building in the eastern GTA, even if both sold within the same quarter. Submarket fundamentals matter enormously here, and an appraiser pulling comparables from the wrong pocket of the region will produce a number that looks defensible on paper but doesn’t reflect actual market behaviour.
The cost approach estimates what it would cost to rebuild the property today, minus depreciation, plus land value. This approach is most useful for newer or purpose-built properties where there isn’t a deep pool of comparable sales, think specialized industrial facilities, breweries, or recently constructed buildings where replacement cost is a meaningful ceiling on value. It’s rarely the primary approach for income-producing assets, but it often serves as a useful check against the other two.
Why the Same Building Can Carry Two Different Numbers
Going back to that office building with the $300,000 gap. The refinancing appraisal leaned heavily on the income approach using in-place rents, which were below market because two tenants were on older leases. The sale-purpose appraisal, prepared a few months later, gave more weight to comparable sales of similar buildings that had recently traded, several of which had stronger in-place income or clearer upside potential.
Neither appraiser was wrong. They were answering different questions for different audiences. A lender wants conservative, defensible income assumptions because they’re underwriting risk. A seller wants the valuation that reflects true market upside, including the income the building could generate once those older leases roll over to market rents.
This is also why accurately valuing commercial property in Toronto’s market starts with one question before any number gets calculated: why is this valuation needed, and who’s going to rely on it? That single question determines which approach gets the most weight, how deep the analysis goes, and what assumptions are defensible.
Why Submarket Fundamentals Change Everything
I valued an industrial building in Vaughan and a nearly identical one in the eastern GTA within the same month. Same square footage, similar age, similar clear heights. The Vaughan property commanded a meaningfully lower cap rate, meaning a higher valuation per dollar of income, because of its proximity to major highway infrastructure and the depth of logistics tenant demand in that corridor.
This happens across every asset class in the GTA. A cap rate that’s appropriate for a Class A office tower on Bay Street tells you almost nothing about what’s appropriate for a similar building in Scarborough or Markham. Retail on a strong urban main street behaves differently than a suburban plaza on a secondary arterial, even when the tenant mix looks comparable on a rent roll.
Zoning compounds this further. A commercial building sitting on a parcel earmarked for mixed-use intensification can carry significant redevelopment value baked into the appraisal, while an otherwise similar building constrained by heritage designation or environmental overlays will be valued more conservatively, regardless of its current income performance. Understanding zoning isn’t a footnote in commercial valuation. It’s often the difference between a building being valued as-is versus being valued for its highest and best use.
What Makes a Report Defensible
Lenders, the CRA, and the courts all care about the same underlying thing: can this number withstand scrutiny? A defensible commercial appraisal in the GTA generally includes a few non-negotiable elements.
The report needs a clearly stated effective date of value, intended use, and intended user. An appraisal prepared for a lender’s underwriting file is held to a different evidentiary standard than one prepared informally for an owner’s own planning purposes, and the report needs to say explicitly what it is and isn’t meant to support.
It needs a physical inspection that actually documents site condition, tenant configuration, and the functional factors influencing value, not a desktop exercise built entirely on assumptions. For income properties, that means a real review of rent rolls, lease terms, and operating statements, not just a headline NOI figure handed over by the owner.
It needs reconciled methodology. On most commercial files, more than one approach gets developed, and the final value conclusion explains how those approaches were weighted and why. A report that only shows one number with no reconciliation of methods gives a lender’s risk officer, or a judge, nothing to evaluate.
I worked on a file involving a retail plaza in Richmond Hill that the owner believed was worth close to $4 million, based largely on his own read of recent area sales. A full commercial property appraisal in Toronto and the GTA placed the actual supportable value closer to $3.2 million once the income analysis corrected for below-market rents on two units and adjusted the comparable set to reflect true submarket activity rather than headline regional numbers. That correction gave the eventual buyer real leverage to renegotiate before closing, and it’s a good example of why the appraisal sits at the center of the financing decision rather than as a formality attached to the end of it.
What This Means for Investors and Lenders
If you’re an investor evaluating an acquisition, the appraisal isn’t just a number to confirm your offer. It’s a tool to stress-test your assumptions about rental income, lease structure, and submarket positioning before you’re financially committed. If the income approach assumptions look optimistic relative to what’s actually happening on the rent roll, that’s worth understanding before closing, not after.
If you’re a lender, the income analysis in that appraisal underpins the debt service coverage ratio that ultimately determines how much you can advance. A dated valuation, or one built on a thin comparable set pulled from the wrong submarket, doesn’t just risk an inaccurate number. It risks a financing decision built on a foundation that won’t hold up if the loan is ever scrutinized later.
Commercial real estate in the GTA doesn’t move in straight lines, and a valuation that treats it like a single, uniform market will be off the mark more often than not. The properties that get valued well are the ones where the appraiser actually understands which approach fits the asset, why the submarket behaves the way it does, and what the report needs to withstand once it leaves their desk.
That’s the work. Not a quick multiple of square footage, and not a generic template applied across every asset type, but a methodology chosen deliberately and a report built to hold up under whoever ends up reading it.
