Back-solve property value from rental income.
Pairs with the cap-rate calculator. You know the income, the calculator returns what the property is worth at current Ontario cap rates — and what to offer.
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Why NOI is the only number commercial brokers won’t show you straight
Net operating income is the income left after paying every operating expense on a commercial property — taxes, insurance, management, repairs, vacancy allowance, utilities if landlord-paid. It’s the number commercial investors capitalize to arrive at property value. Listing brokers know that NOI is the lever, so they present it with optimistic assumptions: zero vacancy on a building with two known long-term tenants whose leases are weeks from expiring; “professional management” expense lines that assume the seller’s brother-in-law continues to manage for free; maintenance lines that pretend the 1970s roof and the original HVAC are in good shape. The result is a “pro forma NOI” 15-30% higher than the actual NOI a buyer will experience. This calculator forces realistic defaults: 5% vacancy, 5% management, 5% maintenance, real property tax and insurance percentages for Ontario commercial. The NOI that comes out is what the buyer will actually see in year one — not the seller’s wish list.
How to back-solve property value from rental income
Commercial valuation works in reverse from residential. Residential buyers start with the asking price and decide whether to pay it. Commercial buyers start with the income, divide by the prevailing cap rate, and arrive at a value they’re willing to pay. If a property generates $288,000 in NOI and comparable Ontario retail plazas trade at 5.5-7.5% cap rates, the property is worth between $3,840,000 (at 7.5%) and $5,236,000 (at 5.5%). The midpoint — $4,430,000 at 6.5% cap — is the fair-market anchor. An asking price of $4.5M is in-range; an asking price of $5.5M is above range and requires investigating why the seller thinks the property earns a premium; an asking price of $3.7M is below range and requires investigating what’s broken. This calculator runs that math automatically. Enter your gross rent and the realistic operating expenses; the calculator returns the value range at current cap rates for your asset class and submarket. Pair it with the cap-rate calculator when you have an asking price already and want to see what cap that implies.
The expense lines sellers always understate
Three expense categories that brokers consistently lowball on listing pro formas. (1) Vacancy allowance: brokers show zero vacancy on stabilized properties. Reality: Ontario commercial vacancy averages 4-6% even on fully leased buildings because of lease turnover, fit-up periods, and tenant defaults. Use 5% as baseline; 7-8% on older retail or office. (2) Repairs and maintenance: brokers show 2-3% of gross rent on older buildings. Reality: a 1970s-1980s Ontario plaza or office runs 5-8% of gross rent annually on maintenance, with occasional capex spikes (roof, HVAC, parking lot resurfacing) every 5-10 years that bring annualized R&M closer to 7%. (3) Property management: brokers show 2-3% or “owner-managed.” Reality: third-party Ontario commercial management averages 4-6% of gross rent, plus leasing commissions on new tenants. Even if you self-manage, value the property as if you’d pay a manager — because the next buyer will. Adjust all three of these upward from broker pro formas and the NOI drops 8-15%. That delta is what most over-confident commercial buyers miss before closing.
More tools: cap-rate calculator · seller net sheet calculator · home value estimate