When you're handed a commercial lease in Ontario, the landlord's first draft is written to protect the landlord. Every clause, every default rule, every vague provision tilts in their favour. The Commercial Tenancies Act, Ontario's governing statute for commercial tenancies, sets only a minimal legal baseline, and it offers far fewer protections than the Residential Tenancies Act that covers home renters.
There is no rent control. There is no automatic right to renew. There is no standardized lease form. What protects your business is the lease you negotiate.
The good news: in 2025 and into 2026, Ontario's commercial real estate market shifted. Industrial rates fell by 13.7% year over year and retail/commercial rates fell by 16.9%, according to 2026 market analysis. Vacancy rates in major Ontario cities are climbing toward 3%, which means landlords are competing for quality tenants. That gives you real bargaining power, but only if you know which Ontario commercial lease clauses to negotiate.
At Hadri Law, we've helped businesses across Toronto, Mississauga, and Ontario review and negotiate commercial leases. Below are the 10 clauses that matter most, followed by answers to the questions we hear most often from business owners.
Understanding Ontario's Commercial Tenancies Act First
Before negotiating, you need to know what the law already gives you, and what it doesn't.
Ontario's Commercial Tenancies Act, R.S.O. 1990, c. C.15 (CTA) governs the relationship between commercial landlords and tenants. Think of it as the default settings for your tenancy. If your lease is silent on a specific issue, the CTA fills in the gap.
Key provisions to know:
- No rent control. The CTA does not regulate rent increases. Your landlord can raise rent by any amount at the end of a term, or as specified in the lease.
- No automatic right to renew. When your term ends, your landlord has no obligation to let you stay.
- Right to distress (distraint). If you fall behind on rent, your landlord can seize and sell your business property without going to court first. They must give notice and hold seized property for five calendar days before any sale. Two appraisals are required before the property can be sold.
- Lock change on day 16. A landlord may change the locks on the 16th day after rent was due, without a court order.
- Right to quiet enjoyment. This is implied in every commercial lease under the Conveyancing and Law of Property Act, R.S.O. 1990, c. C.34, s.23. Your landlord cannot substantially interfere with your ability to use the premises and run your business.
- Overholding. If you stay past your lease end without a new agreement, you may face double rent under section 58 of the CTA, or continue on a month-to-month basis at a higher rate, depending on your lease terms and whether the landlord accepts your rent.
The CTA sets the floor, not the ceiling. Your negotiated lease is what really protects you.
The 10 Clauses to Negotiate in Your Ontario Commercial Lease
1. Rent Structure and Escalation
Commercial leases in Ontario include a base rent, but they also typically include an escalation clause: a built-in mechanism for increasing rent over the lease term. The most common approach is a fixed annual increase of 2-3%. Some landlords push for Consumer Price Index (CPI) linkage, which sounds reasonable until inflation spikes and your rent jumps unexpectedly.
What to negotiate:
- A fixed cap on annual increases regardless of CPI (for example, "the lesser of the CPI increase or 3% per year")
- Clarity on exactly what triggers any step increase
- A clear formula so there is no ambiguity about what you owe in year three, four, or five
The CTA explicitly states it does not regulate rent increases. What you negotiate into the lease is all the protection you have.
2. Lease Term and Renewal Options
The lease term is how long you have the guaranteed right to occupy the space. A first commercial lease in Ontario typically runs three to five years. Shorter terms offer flexibility; longer terms offer stability and give you the chance to build a loyal customer base without the threat of displacement.
The renewal option is separate, and it is not automatic. Without a negotiated renewal option clause, your landlord has zero obligation to let you stay when the term ends, even if you've been a perfect tenant for years. When the clock runs out, it runs out.
What to negotiate:
- At least one five-year renewal option
- A written notice window (typically six to 12 months before the term end), clearly stated in the lease
- A pre-agreed rent formula for the renewal period, or at minimum a clear process (such as mutual agreement or independent arbitration) so the landlord cannot name any number they choose
- Avoid renewal clauses that leave rent entirely to the landlord's "sole discretion"
A renewal option is your business's security blanket. Fight for it.
3. Additional Rent (TMI / CAM)
Base rent is only part of what you pay in most commercial leases. Under a Net lease, and especially under a Triple Net (NNN) lease, which is the most common structure in Ontario multi-tenant plazas, you also pay a proportionate share of Taxes, Maintenance, and Insurance (TMI), sometimes called Common Area Maintenance (CAM) charges.
These charges cover everything from property taxes and building insurance to snowploughing, landscaping, security, and sometimes the property manager's salary. The landlord estimates costs at the start of the year and reconciles at year end. If actual costs exceeded the estimate, you get a bill for the difference, which is often a surprise.
The additional rent section is where the biggest financial shocks hide. Vague language in this clause can allow landlords to include almost any cost they choose.
What to negotiate:
- An exhaustive and exclusive list of what is included in TMI/CAM, with no open-ended catch-all language
- An annual cap on how much CAM/TMI costs can increase year over year (for example, no more than 5%)
- The right to audit the landlord's operating cost records annually
- An explicit exclusion of capital expenditures and management fees from the CAM calculation
4. Tenant Improvement Allowance and Rent-Free Period
Most commercial spaces need work before a new tenant can open for business. A Tenant Improvement Allowance (TIA) is money the landlord contributes to help cover those renovation or fit-out costs. A rent-free period is a stretch of time, typically one to three months (sometimes more), when you occupy the space but pay no rent, giving you time to renovate and set up operations before revenue starts flowing.
Many business owners don't know to ask for either. Both are standard negotiating points, and in 2025-2026's softer commercial market, landlords competing for quality tenants are often more willing to offer them than in previous years.
What to negotiate:
- The TIA amount, the permitted uses for those funds, and the disbursement timeline, all clearly written into the lease
- The rent-free period, with exact start and end dates
- What happens to leasehold improvements if you vacate early (who owns them, who bears the cost)
5. Assignment and Subletting
A lot can change over a five or ten-year lease. Businesses grow, downsize, pivot, and sometimes close. The assignment and subletting clauses are your exit mechanisms.
Assignment is a full transfer: you hand your lease to a new tenant, they step into your position, and you are typically released from further liability. Subletting is different: you rent the space (or part of it) to someone else, but your own lease with the landlord remains. You stay on the hook.
Most leases give the landlord the right to approve any assignment or sublet. Standard language says that approval "shall not be unreasonably withheld," but what counts as unreasonable is often disputed.
What to negotiate:
- A defined timeline for the landlord to respond to an assignment request (for example, 15 to 30 days)
- Objective, pre-agreed criteria for approval (such as the incoming tenant's financial standing), rather than language that gives the landlord "sole discretion"
- A prohibition on the landlord collecting any windfall from the assignment. Some leases allow landlords to pocket the difference between your rent and the new tenant's higher rent. Push to remove this.
6. Use Clause and Exclusivity
The use clause defines exactly what business activities you are permitted to carry out on the premises. It sounds procedural, but it can become a serious operational constraint.
A narrow clause such as "for the sale of artisan coffee and baked goods only" could stop you from adding a lunch menu or selling merchandise without going back to the landlord for permission. Broad clauses give you the flexibility to evolve.
The flip side is the exclusivity clause: a promise from the landlord not to rent adjacent or same-building space to a direct competitor. For a retail or food service business, this protection can be worth more than months of free rent.
What to negotiate:
- Use clause as broad as the landlord will accept: "restaurant and ancillary retail uses" rather than "pizza restaurant only"
- An exclusivity clause for your category, with a clear definition of what constitutes a direct competitor
- A right to object if the landlord proposes to bring in a competing tenant
7. Repair and Maintenance Obligations
The Commercial Tenancies Act says nothing about who is responsible for maintenance. That is entirely up to what the lease says. Vague or poorly drafted maintenance clauses create expensive disputes, and courts will interpret ambiguity against whoever drafted the clause, but getting to a court decision is itself costly.
Tenants are generally expected to maintain the interior of their unit. The question is where the interior ends and the landlord's structural responsibility begins, and what happens to major systems like HVAC.
What to negotiate:
- Landlord is responsible for: structural repairs, roof, foundation, exterior walls, and envelope
- Tenant is responsible for: interior maintenance, daily upkeep, and routine servicing
- HVAC: Negotiate specifically. Routine servicing (filters, tune-ups) is typically the tenant's responsibility; major HVAC replacement should remain the landlord's
- Any capital repair or replacement remains the landlord's obligation regardless of age or condition of the system
8. Personal Guarantee
Many business owners incorporate specifically to separate their personal assets from business liabilities. A personal guarantee clause in a commercial lease undoes that protection entirely.
When you personally guarantee the lease, you promise that if your business cannot pay, you will pay out of your own pocket. If the business fails, the landlord can pursue your personal savings, home equity, and other assets.
Landlords ask for personal guarantees because corporate tenants, especially new businesses, may have limited credit history. But the scope of the guarantee is always negotiable.
What to negotiate:
- A "burn-off" clause: your personal guarantee expires after two or three years of on-time payment
- A dollar cap (for example, the guarantee is limited to six months' rent, not the full remaining lease obligation)
- The guarantee ends upon a valid lease assignment
- Narrow the scope to rent defaults only, not every possible lease obligation
9. Demolition and Relocation Clauses
Two clauses that tenants often overlook until they become a crisis.
A demolition clause allows the landlord to terminate your lease early if they decide to demolish or redevelop the building. If you have invested $100,000 in leasehold improvements and the landlord exercises this right after two years, your investment is gone.
A relocation clause allows the landlord to move you to a different unit in the building, potentially disrupting operations, signage, and the foot traffic patterns your business depends on.
What to negotiate:
- Push to remove the demolition clause entirely; if the landlord insists, require a minimum of 12 to 18 months' notice and full compensation for unamortized leasehold improvements
- Relocation clause: the alternative space must be equivalent or better in size and quality, at the same rent or lower; the landlord pays all relocation costs and any documented business interruption losses
- Note: if you plan to eventually sell your business, a demolition clause can scare off buyers and depress the sale price, which is a strong reason to address it at the outset
10. Insurance Requirements and Indemnity
Every commercial lease will require you to carry insurance, but the specific types, amounts, and named parties are all negotiable.
Landlords routinely require tenants to name them as an additional insured on the tenant's commercial liability policy, giving them a direct claim under your coverage. This is standard. What is worth scrutinising is the indemnity clause, which dictates who bears liability for what.
Overly broad indemnity language can expose you to liability for events that were not your fault, including landlord negligence or third-party incidents in common areas.
What to negotiate:
- Insurance coverage amounts should be proportional to your business type and size. Push back on requirements that exceed what is commercially reasonable.
- A mutual waiver of subrogation: this prevents the insurance companies from pursuing claims against each other's clients, keeping the landlord-tenant relationship out of litigation
- Indemnity limited to losses arising from your own negligence or acts, not the landlord's
- Remove or narrow any language that makes you responsible regardless of fault
- Confirm that the landlord's property insurance does not cover your equipment, inventory, or improvements. You will need your own contents coverage.
Before You Negotiate: A Few Practical Points
Knowing which clauses matter is step one. Walking into the negotiation prepared is step two.
Know your BATNA (your Best Alternative to a Negotiated Agreement). If you have another viable space in mind or the option to extend your current lease short-term, you have real bargaining power. If this is the only space you will accept, the landlord knows it.
Understand the local market. In 2026, rising vacancy rates across Ontario's major commercial markets mean landlords need quality tenants more than they have in recent years. Use market data to anchor your asks.
Consider a commercial real estate agent. A good agent will know the comparable lease rates in your area and can negotiate on your behalf. Their fee is typically paid by the landlord.
And always, always have a lawyer review the lease before you sign. A single overlooked clause can cost you tens of thousands of dollars over the life of the lease.
Frequently Asked Questions About Ontario Commercial Leases
Does the Commercial Tenancies Act protect commercial tenants in Ontario?
The Commercial Tenancies Act (R.S.O. 1990, c. C.15) governs commercial tenancies in Ontario and provides a basic legal framework for both landlords and tenants. However, it offers far fewer protections than the Residential Tenancies Act. There is no rent control, no standardized lease, and no automatic right to renew under the CTA. Your negotiated lease agreement is your primary source of protection.
Can my landlord refuse to renew my commercial lease in Ontario?
Yes. There is no automatic right to renew a commercial lease in Ontario. When your term ends, the landlord has no legal obligation to offer you another term, even if you have paid on time and maintained the space perfectly. Your only protection is a renewal option clause negotiated into the original lease. Without it, you have no right to stay.
What is the difference between assigning and subletting a commercial lease?
Assignment is a full transfer of your lease to a new tenant. The incoming tenant steps into your position, takes on all the lease obligations, and once the landlord approves, you are typically released from further liability. Subletting is different: you rent your space to a subtenant, but you remain the primary tenant responsible to the landlord. If the subtenant stops paying, the landlord comes to you. Assignment is generally the cleaner exit when selling a business.
Can a landlord seize my property for unpaid rent in Ontario?
Yes. Under the Commercial Tenancies Act, landlords have the right of distress: they can seize and sell your business property located on the premises to recover unpaid rent, without going to court. The landlord must give you notice, hold the seized property for five calendar days before any sale, and obtain two appraisals. A landlord may also change the locks on the 16th day after rent was due. These are powerful remedies with no residential equivalent.
What should I do if my landlord violates my right to quiet enjoyment?
The right to quiet enjoyment is an implied covenant in every Ontario commercial lease under the Conveyancing and Law of Property Act, R.S.O. 1990, c. C.34. It means your landlord cannot substantially interfere with your ability to use the premises and operate your business. Repeated unauthorised access, shutting off essential utilities without cause, or disruptive construction that makes operations impossible can all constitute a breach. If you believe your landlord is violating this right, document every incident and consult a commercial lawyer as soon as possible.
What is TMI in an Ontario commercial lease?
TMI stands for Taxes, Maintenance, and Insurance: the components of "additional rent" in a Net lease. On top of your base rent, you pay a proportionate share of the building's property taxes, maintenance costs, and insurance premiums. CAM (Common Area Maintenance) is a closely related term used in multi-tenant commercial properties. In a Triple Net (NNN) lease, tenants bear all three components. Always negotiate a cap on how much these charges can increase from year to year.
Can I get out of a commercial lease early in Ontario?
In most cases, signing a fixed-term commercial lease means you are obligated for the full term. Options for early exit include: (1) assignment (transferring the lease to a new tenant with landlord approval); (2) subletting (if permitted by your lease); (3) negotiating a mutual termination with the landlord, which typically involves paying a settlement. Without a negotiated early termination clause, breaking the lease exposes you to liability for all remaining rent. This is why including a termination option during initial negotiations matters.
How much does a commercial lease review by a lawyer typically cost?
The cost depends on the complexity and length of the lease. For a relatively standard agreement, some lawyers offer a flat-fee review. More complex or heavily negotiated leases are typically billed hourly. The key perspective: the cost of a legal review is almost always small compared to the financial exposure of signing a bad clause. A single clause requiring a personal guarantee or permitting demolition with 60 days' notice could cost you many times the legal fee if exercised.
Sources and Official Resources
- Renting Commercial Property in Ontario, Ontario Government
- Commercial Tenancies Act, R.S.O. 1990, c. C.15, Ontario Laws
- Conveyancing and Law of Property Act, R.S.O. 1990, c. C.34, Ontario Laws
Contact Hadri Law
Signing a commercial lease is one of the most significant financial commitments your business will make. Getting the key clauses right from the start, before you're locked in, can protect your operations, your cash flow, and your personal assets for years to come.
Nassira El Hadri and the team at Hadri Law have helped business owners across Toronto, Mississauga, and Ontario negotiate commercial leases that actually work in their favour. If you are reviewing a lease, considering a renewal, or negotiating terms for a new location, we can help.
Call (437) 974-2374 for a free consultation. We serve clients in English, French, Spanish, and Catalan. You can also book online at calendly.com/hadrilaw/free-consultation.
This article provides general information about Ontario commercial lease law and is not legal advice. Every lease and business situation is different. Contact a lawyer to discuss your specific circumstances.
