The commercial lease sitting on your desk is not just a piece of paper; it can take your business to the next chapter. A single missing clause or a poorly drafted clause can cost you thousands. In these situations, when a dispute arises, even the court will not be able to save you from the terms you signed.
Drafting a commercial lease safeguards your business, maintains flexibility and prevents conflicts. Precision matters. The stakes are too high to guess in the real estate market in Ontario.
What Is Commercial Lease Drafting?
Commercial lease drafting refers to the preparation of an agreement that is legally binding between a tenant and landlord for non-residential properties like retail storefronts, office buildings, warehouses, industrial sites, and mixed-use spaces. In contrast to residential leases, which are governed under the Ontario Residential Tenancies Act, the commercial leases are regulated largely by the contract law and the Commercial Tenancies Act, R.S.O. 1990, c. L.7 (the “CTA”).
Here’s what makes commercial lease drafting different: there’s no standard form. Every lease is negotiated. Every clause matters. And unlike residential tenants, commercial tenants don’t get automatic legal protections. If your lease doesn’t say it, you don’t get it.
A properly written commercial lease agreement clarifies:
- The specific premises under lease (square, parking, storage, etc.)
- Base rent and the computation of extra expenses (property taxes, insurance, repair and maintenance).
- The term of lease, renewal, and termination rights.
- Maintenance and repair of each party.
- Allowed access to the space and limitations.
- What will occur in case either party violates the agreement?
The goal? Create certainty. Eliminate ambiguity. Protect your business from expensive surprises.
You’re not just renting space, you’re entering a multi-year financial commitment. A single unclear clause about HVAC repairs can become a $50,000 dispute. That’s why commercial lease drafting demands precision, not guesswork.
Here’s what happens when lease language isn’t clear: Torstar Corporation leased office space in Toronto and later sublet part of it to another company. Their lease said Torstar had to pay the landlord any “profit” from the sublease. Sounds straightforward until you ask: does “profit” mean the total rent Torstar collected from the subtenant, or only what was left after Torstar deducted its own lease costs? In Pinnacle International (One Yonge) Ltd. v. Torstar Corporation, 2024 ONCA 7551., the Ontario Court of Appeal had to decide. The difference was tens of thousands of dollars. One word in the commercial lease agreement, “profit,” sparked years of litigation because it wasn’t defined clearly. Every word in your lease either protects you or costs you money.
Key Clauses Every Commercial Lease in Ontario Must Include
A properly drafted commercial lease agreement in Ontario should address the following essential elements:
Identification of Parties and Premises
Name the landlord, tenant, and exact property being leased. Include suite numbers, square footage, common areas, parking spaces, and exclusive-use areas. Ambiguity creates disputes before you move in.
Rent Structure and Additional Costs
Your lease should clearly state base rent, whether it’s a net lease, gross lease, or triple net lease, and how additional rent for property taxes, insurance, and common area maintenance (CAM) is calculated. In a triple net lease, tenants pay base rent plus their proportionate share of operating expenses. If the lease doesn’t cap these expenses, you face unlimited increases. Always negotiate caps or verification rights.
Lease Term and Renewal Options
Define the lease term and whether the tenant has renewal rights. Recent Ontario case law demonstrates when courts may provide relief for missed deadlines.
In 8750297 Canada Inc. v. Ambassador Realty Inc., 2025 ONSC 5479 (CanLII)2., a pizza restaurant tenant missed his December 31, 2024, lease renewal deadline due to illness. Despite strict renewal deadlines, the court granted relief from forfeiture under S. 20 of the CTA and S. 98 of the Courts of Justice Act, renewing the lease through 2030.
Courts may excuse missed deadlines for good-faith tenants, but document your renewal intentions early and act immediately if you miss a deadline.
Use Clause and Exclusive Rights
The use clause defines what you can do in the space. If you’re opening a coffee shop, confirm the lease permits food service. Retailers should negotiate exclusive use clauses preventing the landlord from leasing to direct competitors in the same building.
Maintenance and Repair Obligations
The CTA does not set out specific maintenance and repair obligations; these must be detailed in your lease. At common law, if the lease is silent, the landlord is generally responsible for structural repairs. Most commercial leases shift significant repair obligations to the tenant. Know exactly what you’re signing up for and budget accordingly.
Insurance Requirements
Commercial leases usually require general liability insurance and, in many cases, property insurance. Check the required coverage limits and verify that the required additional insureds are listed when signing a commercial lease.
Assignment and Subletting Rights
Most landlords restrict the right to sublet or assign and require consent. “Landlord’s consent not to be unreasonably withheld” differs significantly from “landlord’s sole discretion.” In Pinnacle International (One Yonge) Ltd. v. Torstar Corporation, 2024 ONCA 755 3.(CanLII), Torstar subletted the space it no longer needed. The lease required Torstar to pay the landlord any “profit” from the sublease. The court had to interpret whether this meant gross rent or net profit after deducting Torstar’s lease costs. Every word in a commercial lease carries weight.
Default and Remedies
The Ontario CTA provides landlords with substantial remedies such as distress (seizing tenant property to satisfy rent arrears) and re-entry, which are regulated under S. 30.
The court in Canada Life Assurance Company v. Aphria Inc., 2024 ONCA 882 (CanLII)4. (now before the Supreme Court of Canada), affirmed that in situations where the landlord has no duty to mitigate after a tenant’s repudiation. The principle given in the case Highway Properties Ltd. v. Kelly, Douglas & Co. [1971] SCR 5625. still applies in Ontario that a landlord may collect rent from a tenant, even if that tenant has vacated the property.
Termination and Surrender Provisions
Define early termination conditions and required notice. If the lease limits damages upon termination, ensure it’s enforceable. In the Aphria case, the tenant argued a damage cap applied, but the court found it only applied if the landlord terminated, not if the landlord kept the lease alive.
Common Mistakes in Commercial Lease Drafting
The following are the pitfalls even experienced business owners fall into:
1. Relying on Templates Without Customization
When it comes to commercial leases, every business is different and has different requirements. A warehouse commercial lease template will not fit the lease of a restaurant with grease traps and hood systems. The templates miss nuances, they leave gaps and might result in an expensive and time-consuming litigation.
2. Ignoring Hidden Costs
You saw the base rent of $5,000/month and thought that you had gotten a great deal. Subsequently, you are struck with property taxes, CAM fees and the sudden repair costs. And suddenly you found that your occupancy cost $8000/month. This signifies the need for transparency on additional rent charges.
3. Vague Maintenance Language
“Tenant is responsible for maintaining the premises” sounds simple. But does that include the roof? The parking lot? Structural foundation? Get specific. Ambiguity equals expense.
4. Failing to Negotiate Renewal Terms
When your lease mentions a renewal at market rent, then you have exposed yourself. What’s the market? Who decides? The renewal terms should be clear and fixed.
5. Overlooking Zoning and Permitted Use
Your lease might permit some form of retail use, but municipal zoning might not permit your business model. Confirm zoning prior to signing. Insert some contingencies where necessary.
6. Not Planning for Business Changes
What if your business grows and you need more space? What if you need to downsize? Commercial leases which do not reflect expansion rights, contraction options, and flexibility of assignment can lock you into arrangements that no longer make sense.
Tenants vs Landlords: Commercial Lease Drafting
While dealing with a commercial lease, your priorities depend on the role you are playing in the transaction.
For Tenants:
Your goal is flexibility and cost control. You want:
- Limits on extra/additional rent and operating expense increment.
- Easy rights to sublet or assign in case of a change in business.
- Early termination solutions based on event-specific triggers (e.g. revenue cutoffs).
- Defences against rent hikes that you can neither predict nor afford.
- Obligations of the landlord are well established (who repairs what and when).
Tenants should also negotiate for improvement allowances or rent abatement during construction periods. If you’re building out a space, negotiate who pays for what and whether you get free rent while work is ongoing.
For Landlords:
Your goal is a stable income and property protection. You want:
- Guaranteed rent with minimal exceptions
- Tenant maintenance obligations that shift repair costs
- Restrictions on subletting that give you control over who occupies your building
- Clear default remedies and the right to terminate quickly if the tenant breaches
- Security deposits or personal guarantees (especially with startups)
The continuous operation clauses (the tenant must be running their business, not just making payments) and co-tenancy clauses (defending anchor tenants in case the property is deprived of key tenants) should also be addressed by the landlords.
Commercial Lease Drafting vs Lease Review
Lease drafting and lease review serve different purposes:
- Commercial lease drafting in simple words refers to the drawing up of the agreement. The landlord’s lawyer (or the landlord themselves in the case of standard forms) normally does this; however, more complex tenants sometimes write their own proposals to dominate the negotiation.
- Lease review is a process of reviewing an already prepared draft lease, typically done by the other party, to determine the risks and suggest amendments and improved terms. The majority of the tenants are provided with a lease prepared by the landlord, and they seek the advice of counsel before signing.
Both are critical. Drafting sets the framework. Review catches the traps.
If you’re a tenant, don’t just accept the landlord’s form and hope for the best. Even if you’re not drafting the lease yourself, your lawyer should be marking it up with protective amendments before you sign.
Do You Need a Lawyer for Commercial Lease Drafting in Ontario?
Yes. And here’s the reality check: if you’re willing to risk six-figure losses over unclear lease terms, go ahead and try this alone. But most business owners who care about protecting what they’ve built don’t gamble with their future.
- Ontario commercial leases operate in the wild west. Unlike residential tenancies with their government-mandated protections, commercial leases are governed by contract law and whatever you negotiate. The Commercial Tenancies Act gives you some basic rules, but your lease controls everything else. Miss a critical provision? You’re headed to court to sort it out, and legal fees alone can sink a small business.
- You’re not signing a one-year deal. That 10-year lease with renewal options? You have just made a long-term commitment of 20 years. An increase in rent which you did not cap, operating costs that you did not restrict and maintenance bills you did not comprehend can wipe hundreds of thousands of dollars out of your business over a period of twenty-plus years. It is not a cost to get the terms straight now, but it is a guarantee that there will be nothing left to worry about in the future. Drafting the terms right at the initial stage is not an unnecessary expense, but it works like insurance for you.
- Courts won’t fix bad drafting. The lesson we get from the Aphria case is that the court interprets the terms we signed and not the deal you thought you made. In case of unlimited CAM increases in your lease, you will have to pay unlimited CAM increases. When it is ambiguous who did the HVAC repair, you will be litigating over a $40,000 replacement. Sloppy writing is a loss in itself.
- The other side has a lawyer. Every landlord-prepared commercial lease agreement is designed to protect the landlord first. That’s not evil, it’s business. But it means you need someone on your side who knows which terms are negotiable, which protections you’re missing, and how to level the playing field without killing the deal.
How a Commercial Lease Lawyer in Ontario Helps
Think of a commercial lease lawyer as your business translator and protection specialist rolled into one.
- They negotiate strategically. A skilled lawyer knows the difference between deal-breakers and standard terms. They’ll push for rent caps and early termination rights without making the landlord walk away. They understand Ontario’s commercial real estate market and what’s actually achievable in your negotiations.
- They catch the traps before you sign. That innocent-looking clause about “tenant responsible for all repairs”? Your lawyer spots that it could stick you with a $100,000 roof replacement. The renewal option that requires 180 days’ written notice? They will mark it and ensure that you have mechanisms to trace it. These are not hypothetical dangers; they are the cases that are still coming to Ontario courts on an annual basis.
- They handle compliance and due diligence. They ensure that the zoning of the municipality allows the use you intend to make before you commit. They ensure that the square footage is the same for what you are paying. They will make sure that you are not taking over the environmental liabilities or property tax conflict of another person.
- They prevent expensive litigation. Ambiguity is avoided through clear and precise drafting of the lease. Each dollar you invest in a proper legal review will save you a $10 legal bill in the future when a vague provision causes a wrangle. Skilled lawyers not only read contracts, but they also eliminate situations to prevent litigation.
- They’re there when you need them. Business changes. Maybe you need to sublet. Maybe the landlord wants to amend the lease. Maybe you’re approaching a renewal deadline and need guidance. Your lawyer isn’t just for signing day; they’re your ongoing resource for navigating the commercial relationship you’ve entered.
The question isn’t whether you can afford legal counsel for your commercial lease. It’s whether you can afford not to have it.
How Can Pacific Legal Help You?
At Pacific Legal, we help landlords and tenants navigate commercial lease agreements with confidence. Whether you’re negotiating your first retail lease or managing a portfolio of properties across Ontario, we provide practical, business-minded legal support at every stage.
We draft commercial leases that protect your interests. We review landlord-prepared agreements and negotiate better terms. And if disputes arise, we resolve them efficiently. Just clear, strategic advice from lawyers who understand how commercial real estate actually works.
If you’re signing a commercial lease in Ontario, don’t go it alone. Reach out to Pacific Legal and get the clarity you need to move forward with confidence.
Frequently Asked Questions
How much does commercial lease drafting cost in Ontario?
Legal fees for commercial lease drafting or review typically range from $1,500 to $5,000+, depending on complexity. Simple retail leases in standard buildings cost less. Complex industrial leases with custom build-outs, multi-tenant arrangements, or sophisticated rent structures cost more. Many firms (including Pacific Legal) offer flat-fee pricing so you know the cost upfront. Paying a lawyer $3,000 now can save you $100,000 in disputes later.
Can a commercial lease be amended after signing?
Yes, but both parties must agree. Amendments should always be in writing and signed by both the landlord and tenant. Verbal agreements to modify a lease are difficult to enforce and often lead to disputes. If circumstances change, your business expands, rent needs adjustment, or repair obligations need clarification, work with your lawyer to draft a formal amendment.
How long does it take to draft a commercial lease?
A straightforward commercial lease for a standard space can be drafted in a few days. More complex transactions, especially those involving custom construction, unique use restrictions, or extensive negotiations, can take weeks. The timeline depends on how quickly both parties respond, how many rounds of revisions are needed, and whether there are contingencies (like zoning approvals or financing conditions).
Is a commercial lease legally binding in Ontario?
Yes. Once signed by both parties, a commercial lease is a binding contract enforceable under Ontario law. Courts will generally hold parties to the terms they agreed to, even if those terms later prove unfavourable. That’s why reviewing the lease carefully before signing is critical. Unlike residential leases, you can’t count on government protections to save you.
What happens if a clause is unclear or missing?
Ambiguity creates risk. If a commercial lease is silent on an issue, the CTA may provide a default rule, but often, it doesn’t. In that case, the parties end up in court, where judges interpret the contract based on general principles of contract law, industry customs, and the parties’ apparent intentions. This is expensive, uncertain, and avoidable. The solution? Draft comprehensive leases that address foreseeable issues upfront. If a clause is truly unclear, expect litigation over what it means, and neither party will like the outcome.
Source:
1Pinnacle International (One Yonge) Ltd. v. Torstar Corporation, 2024 ONCA 755 (CanLII), <https://canlii.ca/t/k7b40>
2 8750297 Canada Inc. v. Ambassador Realty Inc, 2025 ONSC 5479 (CanLII), <https://canlii.ca/t/kfm9b>
3 Pinnacle International (One Yonge) Ltd. v. Torstar Corporation, 2024 ONCA 755 (CanLII), <https://canlii.ca/t/k7b40>
4 Canada Life Assurance Company v. Aphria Inc., 2024 ONCA 882 (CanLII), <https://canlii.ca/t/k8937>
5 Highway Properties Ltd. v. Kelly, Douglas and Co. Ltd., 1971 CanLII 123 (SCC), [1971] SCR 562, <https://canlii.ca/t/1xd47>
