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Commercial Market Rent Appraisal Services in Ontario

Name: Commercial Market Rent Appraisal
Author: Ashita Chandra

A commercial market rent appraisal is an independent, CUSPAP-compliant opinion of the rent a space would achieve on the open market, on the terms and at the date a lease specifies, prepared by an AACI-designated appraiser. Landlords and tenants across Southern Ontario use it when a lease renews or resets at "market rent", before they negotiate, when a lender tests a rent roll, and as evidence when the rent goes to arbitration. The opinion is a rent per square foot per year, net or gross as the lease provides, usually delivered within 5–10 business days of the site visit.

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Our Commercial Market Rent Appraisal Services in Ontario Service Areas

Lease Renewal Market Rent Opinion

For a renewal option that resets rent to "market rent", the report gives the year-one rent for the renewal term on the lease's own terms: the same use, the same cost responsibilities and the same premises. It is written so landlord and tenant can settle without a hearing.

Rent Review (Reset) Appraisal

Some leases reset rent partway through the term. The appraisal answers the exact question the review clause asks, at the review date, and says how each assumption in the clause was applied.

Retrospective Market Rent at a Past Renewal Date

By the time the parties disagree, the renewal date has often passed. The report gives the market rent at that date, relying on leases agreed before it and using later leases only as a check.

Arbitration and Litigation Rent Evidence

When the rent goes to an arbitrator or a court, the report is built to be read by the other side's appraiser: every instruction disclosed, every comparable on the same basis. Expert testimony runs under our litigation support and arbitration service.

Rent Roll Review for Lenders and Buyers

A lender or buyer may want in-place rents tested against the market. The report compares each lease with market rent for its space, so the income a value rests on is supportable.

Landlord and Tenant Negotiation Support

Before a renewal conversation, an independent market rent tells either side what the evidence supports, on a stated area and lease basis, so the negotiation starts from numbers both can check.

Retail strip plaza in Southern Ontario leased at market rent.

CUSPAP-Compliant Commercial Market Rent Appraisal Services in Ontario

It is an independent opinion of the rent a commercial space would achieve on the open market, on the terms and at the date a lease sets. Landlords, tenants, their lawyers, lenders and buyers order it. Common applications: lease renewals at market rent, mid-term rent reviews, rent arbitration, negoti

Large retail establishment in Ontario, the kind of space valued in a commercial market rent appraisal.

What Is a Commercial Market Rent Appraisal and How Is It Used in Ontario?

A commercial market rent appraisal is an AACI appraiser's opinion of the rent a space would most probably achieve on the open market, at a stated date, on stated lease terms. It differs from a value appraisal in one way that drives everything else: the answer is a rent per square foot per year, not a capital value, and direct comparison with other leases carries the opinion.

In Ontario the most common trigger is a renewal option or rent review clause that sets the new rent at "market rent". The parties use the report to settle; if they cannot, the lease's arbitration clause usually sends the question to an arbitrator, who weighs each side's evidence. Lenders and buyers also order market rent reports to test whether a rent roll is sustainable.

Because the reader is often counsel, an arbitrator or the other side's appraiser, the report is written to survive a hostile reading as well as a friendly one.

Retail shop unit in a commercial building, measured for a market rent opinion.

How Does the Lease Define the Rent Question?

The lease, not the market alone, defines what is being valued. The renewal or review clause sets the date, and the rest of the lease sets the terms the rent assumes: the term, net or gross, who pays taxes, maintenance and insurance, the permitted use, any exclusivity, and parking.

Inducements matter. A new tenant may receive free rent or a tenant improvement allowance; a sitting tenant renewing usually does not. Unless the lease or counsel says otherwise, the report gives the face rent for year one of the renewal term with no inducements, and compares the comparables on the same footing.

The improvements premise matters most. Whether the tenant pays rent on its own fit-out depends on the lease's fixtures, alterations and renewal clauses. The report cites those clauses, states the basis it adopts, and gives the figure on the other basis when the lease is unclear, so an arbitrator can apply their own reading.

Lease term	What the appraiser asks	Why it moves the rent
Renewal or review clause	Which date, and what "market rent" means here	Sets the effective date and the definition
Net or gross	Who pays taxes, maintenance and insurance	A gross rent includes costs a net rent leaves out
Term and steps	How long, and whether rent steps up	Longer terms and steps change year-one rent
Use and exclusivity	What the tenant may do, and what the landlord may not lease to others	Restrictions can raise or lower rent
Improvements	Who owns the fit-out at renewal	Decides whether the tenant pays rent on its own work

Retail mall units in Ontario compared in a lease-renewal rent study.

How Is Market Rent Measured From Comparable Leases?

The appraiser collects leases of similar space agreed on or before the effective date, usually within about two years, and confirms each one's basis, area, term, steps and inducements from the listing record, the agent or the parties.

Every comparable is converted to the subject's basis before it is adjusted. A gross lease is reduced to net using that property's own taxes, maintenance and insurance, not a blanket allowance, and a lease with free rent is read as effective rent as well as face rent. Only then are adjustments made for location, size, condition, frontage and time.

Leases signed after the effective date are kept apart. Space that was on the market at the date and leased later shows what the market was asking; leases that came later still confirm the direction of the market and are never the basis of the opinion.

Retail store plaza in Southern Ontario where market rent is set at renewal.

What Area Does the Rent Apply To?

A rate per square foot means nothing without the area it applies to. In Ontario the lease area, the MPAC area, the landlord's measured rentable area and the appraiser's own measurement can all differ.

The report sets out each area, its source and its basis, explains the differences, measures the premises at the inspection, and states which area the opinion uses.

It then shows the annual rent on each candidate area. If an arbitrator decides a different area applies, the rate still holds and the annual figure reads straight from the table.

Specialty retail premises valued for a rent review.

Who Prepares a Market Rent Appraisal, and What Should You Send?

Market rent reports on commercial space are prepared by an AACI-designated appraiser under CUSPAP, which sets specific requirements for market rent reports. Aion's are led and signed by Ashita Chandra, AACI, P.App, and reviewed by a second appraiser before they are issued.

Where the rent is in dispute, the same report supports negotiation, mediation or arbitration, and our litigation support and arbitration appraisal service covers expert testimony.

To quote, send the lease and every amendment, the renewal or review notice, the date the new rent applies from, any floor plan or measurement, and the property's taxes, maintenance and insurance figures. Fees are quoted per assignment, with a written quote before any work starts.

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What Is a Commercial Market Rent Appraisal and Who Needs It in Ontario?

Common applications: lease renewals at market rent, mid-term rent reviews, rent arbitration, negotiating a new lease, and testing a rent roll before a loan or purchase.
Space covered: retail units and plazas, office suites and buildings, industrial units, medical and professional space, and the commercial floors of mixed-use buildings.

How Does the Market Rent Appraisal Process Work in Ontario?

Lease and instructions: we read the lease, every amendment and the notice, and confirm what we are asked.
Date and basis: the effective date, net or gross, the term, and the improvements premise are fixed in writing.
Inspection and measurement: the premises are inspected and measured.
Lease evidence: comparable leases agreed on or before the date, each confirmed and converted to the same basis.
Adjustment and reconciliation: one rent per square foot, with the annual rent shown on each candidate area.
Review and delivery: a second appraiser reviews the report; delivery is usually 5–10 business days after the site visit.

Why Does a Market Rent Appraisal Matter for Landlords and Tenants?

Small differences in rate compound over a term. A $2.00 per square foot difference on 2,000 square feet is $4,000 a year and $20,000 over a five-year renewal, before any steps.

An independent figure on a stated area and basis lets both sides test the same numbers. When they cannot agree, it is the evidence an arbitrator weighs.

What Should You Know Before Commissioning a Market Rent Appraisal?

Read the renewal clause first. The date and the meaning of "market rent" come from it.
Settle the area early. A dispute over square feet can be worth as much as a dispute over the rate.
Disclose every instruction. Anything the client asks the appraiser to assume is written into the report as an assumption.
Later leases are a check, not the answer. The opinion rests on evidence available at the date.
Joint instruction is possible. Landlord and tenant can instruct one appraiser together; the report names both.

How Do Ontario Arbitrators Decide a Market Rent Dispute?

When landlord and tenant cannot agree, most commercial leases send the rent to arbitration. Unless the lease provides otherwise, Ontario's Arbitration Act, 1991 governs the process, and the lease's own clause sets the details: one arbitrator or three, the timetable, and sometimes the format.

A typical rent arbitration runs in this order:

One party gives notice under the lease, and the arbitrator or panel is appointed.
Each side files an appraisal report, and reply reports often follow.
At the hearing, each appraiser presents their report and is cross-examined.
The arbitrator issues an award setting the rent from the date the lease specifies.

Some leases use final-offer arbitration, where the arbitrator must choose one side's figure. A credible number then matters more than an ambitious one, because the less supportable figure loses outright.

Arbitrators start with the lease definition: what "market rent" means in this lease, on what terms, and at what date. Then they weigh the evidence: how close the comparables are to the subject, whether each was converted to the same basis before it was adjusted, and whether the appraiser stayed independent. An expert who argues for a side instead of explaining the market loses weight quickly.

Reports that may go to court carry the acknowledgement of expert's duty (Form 53) required by Ontario's Rules of Civil Procedure, and arbitrators often ask for the same commitment. Aion can prepare the report for one party, review the other side's report under CUSPAP, and give evidence at the hearing.

What Is Net Effective Rent, and Why Does It Differ From Face Rent?

Face rent is the rate written in the lease. Net effective rent is what the landlord actually receives once inducements are taken off and spread over the term. Comparable leases are often signed with free rent or a tenant improvement allowance, so a face rate alone overstates the market.

A simple example, on a five-year lease of 2,000 square feet:

Item	Total per sq ft	Per sq ft per year
Face rent, net		$20.00
Three months' free rent	$5.00	−$1.00
Tenant improvement allowance	$10.00	−$2.00
Net effective rent (straight-line)		$17.00

The free rent is three months at $20.00, or $5.00 a square foot, spread over five years. The allowance is $10.00 a square foot spread over the same term. A discounted calculation, which values money received early more than money received later, gives a slightly different figure, and the report states which method it uses.

This matters most at renewal. A sitting tenant who renews usually receives no free rent and little or no allowance, so the renewal rent is compared with comparable face rents adjusted for the inducements those tenants received. Leaving the inducements in overstates the rent; taking them out without reading the leases understates it. The report shows the conversion for every comparable, so the other side and the arbitrator can check each step. Landlord's work and moving allowances are treated the same way when the evidence shows them.

How Does Market Rent Differ for Retail, Office and Industrial Space?

Rent per square foot is driven by different features in each type of space, and the comparables are adjusted for the features that matter to that type.

Retail. Frontage, visibility and the strength of neighbouring tenants carry the most weight. Small units usually rent for more per square foot than large ones in the same plaza. The appraiser reads the exclusive-use clauses, any percentage rent, and how common area costs are recovered, because each changes what a tenant would pay.

Office. Rents are quoted net, semi-gross or gross, with additional rent for operating costs and taxes stated separately per square foot. Building class, floor plate efficiency, parking ratio and the condition of the suite matter, and inducements are usually larger than in retail or industrial leases. Sublease space on the market competes with direct leases and is weighed accordingly.

Industrial. Rents are almost always net. Clear height, the number and type of shipping doors, the share of the unit finished as office, power supply and outside storage drive the rate. Small-bay units of a few thousand square feet usually rent for more per square foot than large distribution space.

Medical, restaurant and other special uses. Plumbing, venting and fit-out that suit one use can raise the rent a specialised tenant would pay, or narrow the pool of tenants who would pay it. The report states which premise it adopts.

In each case the lease's own terms come first. A permitted-use clause that limits what the tenant may do also limits the rent the open market would pay for that space.

When Should a Landlord or Tenant Order a Market Rent Appraisal?

The best time is before anyone commits to a number.

Before the renewal notice deadline. Many leases require the tenant to exercise a renewal option in writing within a set window, often six to twelve months before expiry, and missing it can lose the option. A rent opinion before the deadline tells the tenant whether renewing at market rent makes sense.
Before the first proposal. A landlord's opening figure, or a tenant's response, anchors the negotiation. An opinion backed by comparable leases moves the conversation from positions to evidence.
When the lease sets an appraisal procedure. Some leases require each party to appoint an appraiser within a fixed number of days, or name a single appraiser both must accept. Read the clause early; the timetable usually runs from a notice, not from when the parties start talking.
After the review date has passed. Rent is set as of the date in the lease, even if negotiations run long. The report then uses the evidence available at that date, as a retrospective opinion.
Before a refinancing or sale. If rents in place are above or below market, a lender or buyer will price the income accordingly. A market rent opinion shows which leases carry risk at renewal and which have upside.

When both parties appoint one appraiser jointly, the report is addressed to both and both receive the same evidence.

What Does a Market Rent Report Contain?

A market rent report is built so that a reader who disagrees can follow every step. Aion's reports set out:

The question. The lease clause quoted in full, the definition of market rent adopted, the effective date, and the terms the rent assumes.
The premises. A description from the inspection, the measured area alongside the lease and other recorded areas, and the improvements in place.
The market. Supply, vacancy and leasing activity for that type of space in that location at the date.
The evidence. Each comparable lease with its source, date, area, term, basis and inducements, and the conversion to the subject's basis.
The adjustments. A grid showing every adjustment for location, size, condition, frontage or loading, and time, with the reason for each.
The conclusion. The rent per square foot per year, the annual rent on each candidate area, and the figure on any alternative premise the lease leaves open, such as the treatment of tenant improvements.
The fine print. Assumptions, limiting conditions, the appraiser's certification under CUSPAP and their qualifications.

The conclusion section answers the lease's question in the lease's own terms, so the parties or the arbitrator can apply it without translation.

How Are Rent Steps and Long Renewal Terms Handled?

Some leases ask only for the rent at the start of the renewal term. Others ask for the market rent "for the renewal term", which can run five or ten years.

When the question covers the whole term, the appraiser considers what the market pays for a term of that length. Leases of five years or more commonly include fixed steps, either annual or at mid-term. If the comparables show that pattern, the report gives a year-one rent and a step schedule the evidence supports, and explains how it was derived.

If the lease is silent on steps, the report gives the flat rent for the term as the primary figure and the stepped alternative beside it, so the parties can apply whichever reading the lease supports. Longer terms also affect the comparables used: a ten-year renewal is compared first with leases of similar length.

How Do Taxes, Operating Costs and HST Affect a Market Rent Opinion?

A tenant decides between two spaces on what it will pay in total, not on base rent alone. The report therefore reads every cost the lease passes through.

Additional rent. In a net lease the tenant pays base rent plus its share of realty taxes, maintenance and insurance, often called additional rent or TMI. In a gross lease the landlord pays those costs out of the rent, and a semi-gross lease splits them.
Each property's own costs. When a comparable is converted from gross to net, the appraiser uses that property's own taxes and operating costs for the year, from the landlord's budget or the listing, not a rule of thumb. These costs vary widely: an older plaza with a high assessment can carry several times the additional rent of a newer industrial building.
Total occupancy cost. If the subject's additional rent is unusually high, a tenant paying net rent plus those costs pays more in total than tenants elsewhere, and the market would pay less base rent to compensate. The report can show total occupancy cost per square foot beside the base rent, so the comparison is visible.
Fees and capital items. Many net leases add an administration fee on operating costs, and some let the landlord recover capital repairs spread over their useful life. These clauses change what the tenant pays, so the report notes them for the subject and for each comparable where the lease is available.
Gross-up clauses. In multi-tenant office buildings, variable costs are often calculated as if the building were close to fully occupied. The report notes the clause when it changes a comparable's additional rent.
HST. Commercial rent in Ontario attracts HST on top of the rent. Rent opinions are stated before HST, as leases quote them.

Realty taxes also move with the assessment. A successful tax appeal or a reassessment changes the additional rent the tenant pays, and the report states the tax figure it relies on and its source.

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Frequently Asked Questions about Market Rent Appraisal

What is market rent?

The rent a space would most probably achieve on the open market, on the lease terms specified, at a stated date.

What is the difference between market rent and contract rent?

Contract rent is what the lease says the tenant pays. Market rent is what the space would rent for at the date in question, on the same terms.

Is the rent net or gross?

Whichever the lease provides. Every comparable is converted to the same basis, using its own property's costs, before it is compared.

Can you give market rent as of a past date?

Yes. Renewal dates have often passed by the time the parties disagree; the report relies on the leases available at that date.

Do you measure the unit?

Yes, at the inspection, and the report sets out every other area on record with its source.

What if the lease area and the measured area differ?

The report states the area it adopts and shows the annual rent on each candidate area, so the rate holds whichever area is found to apply.

Does the tenant pay rent on its own improvements?

It depends on the lease. The report cites the fixtures, alterations and renewal clauses and states the basis it adopts.

Are free rent and tenant allowances included?

For a sitting tenant renewing, usually not, unless the lease or counsel says otherwise. Comparables with inducements are read on an effective-rent basis as well.

Can the report be used in arbitration?

Yes. It is written to be read by the arbitrator and the other side's appraiser; see litigation support and arbitration appraisal for testimony.

Can landlord and tenant share one appraiser?

Yes, if both agree to instruct jointly. The report names both as its users.

How long does a market rent appraisal take?

Usually 5–10 business days after the site visit.

How much does a market rent appraisal cost?

Fees are quoted per assignment, with a written quote before any work starts. See what affects the fee.

What types of space do you appraise?

Retail, office, industrial, medical and professional space, and the commercial floors of mixed-use buildings.

Do you prepare residential market rent reports?

Not for houses, condominium units or single apartments. For apartment buildings of five or more units, market rents are part of our multi-unit residential appraisal.

Last reviewed: October 22, 2026

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