Commercial Real Estate Mistakes Toronto

By Allen Mayer, Commercial Real Estate Broker | RE/MAX Ultimate Realty Inc.
Over 25 years helping Toronto businesses avoid expensive leasing errors

In twenty-five years of representing commercial tenants across Toronto, Mississauga, Barrie and Vaughan, I have watched businesses make the same preventable commercial real estate mistakes repeatedly. Some cost them thousands in unnecessary expenses. Others locked them into spaces that sabotaged their growth before they even opened their doors.

The commercial leasing process is deliberately opaque. Landlords and their brokers have institutional knowledge and legal teams. Most business owners are negotiating their first or second commercial lease with no one in their corner who has done this hundreds of times.

This is not theoretical advice. These are the specific commercial real estate mistakes Toronto tenants made in actual deals I worked on — and the exact strategies I used to prevent them or fix them after the fact.

Mistake #1: Signing a Lease Before Understanding Your True Occupancy Cost

The Problem

A client came to me last year after signing what they thought was a $22 per square foot lease for 2,000 square feet in North York. Their projected occupancy cost: $44,000 annually.

Six months in, their actual cost was $67,000. They had misunderstood the net lease structure and failed to account for their proportionate share of property taxes ($8,200), common area maintenance ($11,400), and building insurance ($3,400). These additional costs were disclosed in the lease — in paragraph 14, subsection C — but no one explained what they actually meant in dollar terms.

What Experienced Brokers Know

In a gross lease, the base rent is your total cost. In a net lease — the standard structure for 90% of Toronto commercial properties — your base rent is just the starting point. You pay base rent plus your share of operating expenses.

Always ask the landlord’s broker for the previous year’s audited operating cost statement before signing anything. This is public information for existing tenants, and any landlord refusing to provide it is a red flag.

Calculate your estimated total occupancy cost per square foot by adding base rent plus the previous year’s operating expenses. If the landlord claims costs will be lower this year, get that commitment in writing with a cap.

Mistake #2: Choosing a Location Based on Rent Instead of Revenue Potential

The Problem

A retail client in 2023 chose a 1,200-square-foot space in Scarborough at $28 per square foot over a 1,000-square-foot space on Queen Street West at $55 per square foot. The Scarborough space was “a better deal.”

After eighteen months, the Scarborough location generated $340,000 in annual revenue. If they had taken the Queen West space, I estimate — based on comparable tenant performance — they would have done $720,000 in the same period.

Their rent savings: $22,400 annually.
Their revenue loss: $380,000 annually.

They are now trying to break their Scarborough lease to move downtown, which will cost them tens of thousands in lease termination penalties.

What Experienced Brokers Know

Rent is not your most important expense. It is your cost of customer access.

A high-rent location in a high-traffic area will outperform a cheap location in a low-visibility area for virtually every retail, restaurant, or service business. The only exception is pure destination businesses where customers actively seek you out regardless of location — and even then, accessibility still matters.

I tell clients to evaluate locations by revenue potential per square foot, not rent per square foot. A $60/sf space that generates $800/sf in revenue is a far better deal than a $30/sf space that generates $250/sf in revenue.

If you are opening a retail or food business and you do not know the average revenue per square foot for your category in different Toronto neighborhoods, you are making a decision blind.

Mistake #3: Failing to Negotiate a Tenant Improvement Allowance

The Problem

A professional services client signed a five-year lease for 3,500 square feet of office space in Mississauga in 2025. The space was delivered as a bare shell. They spent $110,000 on tenant improvements — demising walls, flooring, lighting, HVAC distribution, electrical, and finishes.

I reviewed their lease afterward. There was no tenant improvement allowance. The landlord contributed zero dollars.

Three months later, I negotiated a lease for a nearly identical space in the same building for a different client. The landlord provided a $25 per square foot tenant improvement allowance — $87,500 — because we asked for it and justified it based on comparable market deals.

The first client left $87,500 on the table because they did not know to negotiate for it.

What Experienced Brokers Know

Tenant improvement allowances are standard in the Toronto commercial market, especially for office and retail spaces requiring significant build-out. Landlords expect you to ask. If you do not ask, they will not offer.

The allowance amount varies by property type, lease term, and market conditions, but general ranges in 2026 are:

Class A office: $40–$70 per square foot for a 5+ year lease
Class B/C office: $20–$40 per square foot
Retail (shopping center): $15–$35 per square foot
Industrial: $5–$15 per square foot

Landlords will often agree to a higher allowance in exchange for a longer lease term or a slightly higher base rent. This is almost always a good trade for the tenant, because you are financing your build-out at no interest over the lease term instead of spending cash upfront.

If you are signing a lease for unfinished space, negotiating a TI allowance is non-negotiable.

Mistake #4: Accepting a Percentage Rent Clause Without Understanding the Math

The Problem

A restaurant client signed a lease in a Vaughan shopping center with base rent of $45,000 annually plus 8% of gross sales over $600,000 (the “natural breakpoint”).

In year two, the restaurant did $950,000 in sales. Their percentage rent obligation: 8% × ($950,000 – $600,000) = $28,000.

Their total rent for the year: $73,000.

They had budgeted for $45,000. The percentage rent clause turned a manageable lease into an unsustainable one. They are now in arrears and negotiating a lease termination.

What Experienced Brokers Know

Percentage rent clauses are standard in shopping centers and high-street retail, but the math has to work for your business model.

A well-structured percentage rent clause should only kick in after you have achieved strong profitability. The natural breakpoint — the sales threshold above which percentage rent applies — should be set at a level where paying additional rent does not compromise your margins.

A safe formula: Your natural breakpoint should be set at roughly 10–12× your base rent.

If your base rent is $50,000, your breakpoint should be $500,000–$600,000 in gross sales. Below that threshold, percentage rent becomes a growth penalty.

Also negotiate what counts as “gross sales.” Many landlords try to include non-retail revenue — catering, wholesale, online sales fulfilled from your location. Push back. Percentage rent should apply only to in-store retail sales.

Mistake #5: Not Reading the Renewal Option Clause (Or Not Including One)

The Problem

A commercial tenant in Toronto signed a strong five-year lease in 2020 for office space in Liberty Village. In year four, their business had grown significantly. The space worked well. They wanted to stay.

Their lease had no renewal option.

The landlord knew they were locked in. Relocating would disrupt operations, cost tens of thousands in moving expenses, and require another expensive tenant build-out. The landlord offered a renewal at $52 per square foot — a 44% increase from their original $36/sf rate.

Market rate for comparable space in the area at the time: $42 per square foot.

The tenant had no negotiating leverage. They either paid the inflated rate or moved. They paid.

A renewal option clause would have capped the increase at market rate and given them the security to stay without penalty.

What Experienced Brokers Know

Always negotiate at least one renewal option when signing your initial lease. A renewal option gives you the right — but not the obligation — to extend your lease for an additional term at a predetermined rent.

The renewal rent is typically set at one of three ways:

Fixed percentage increase: e.g., 95% of then-current market rent
CPI adjustment: Rent increases by the Consumer Price Index
Fair market value: Rent adjusts to market rate, determined by appraisal if parties disagree

Option 1 is best for tenants. You get the security of staying while paying slightly below market rate.

The renewal option must be in your initial lease. You cannot negotiate it later. If your lease is silent on renewal, the landlord has no obligation to offer you any terms when your lease expires.

I have seen landlords refuse to renew leases entirely, forcing tenants to relocate, simply because the landlord wanted to convert the building or bring in a higher-paying tenant. A renewal option prevents this.

Why These Mistakes Keep Happening

Most business owners negotiate one or two commercial leases in their career. Landlords and their brokers negotiate hundreds. It is an asymmetric information game, and tenants lose by default unless they bring their own experienced representation.

Commercial leasing in Toronto is not a standardized process. Every lease is negotiable. Every clause can be rewritten. But only if you know what to ask for — and how to justify it.

Work With a Toronto Commercial Real Estate Broker Who Represents Tenants

I have spent twenty-five years on both sides of commercial lease negotiations. I have represented landlords who wanted maximum rent and tenants who wanted maximum protection. I know what landlords will concede and what they will not. I know which clauses matter and which are filler.

If you are searching for commercial space in Toronto, Mississauga, Vaughan, or the broader GTA, you need a broker in your corner who has done this hundreds of times.

View current commercial listings across the GTA or schedule a complimentary consultation to discuss your requirements.

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About the Author:
Allen Mayer is a licensed commercial real estate broker with RE/MAX Ultimate Realty Inc. and a member in good standing with RECO, TRREB, and CREA. He has represented commercial tenants and landlords across Toronto and the GTA for over twenty-five years.