Commercial Lease Agreements in Ontario: Key Clauses for Businesses

Commercial leases in Ontario operate under a fundamentally different set of rules than residential tenancies. The Residential Tenancies Act, which provides significant baseline protections for residential tenants, generally does not apply to commercial space at all. That means commercial landlords and tenants are largely free to negotiate their own terms, and a court will generally enforce what the lease actually says, without the same layer of statutory protection that residential tenants can rely on.

This makes the negotiation and drafting stage far more consequential for a commercial tenant than it typically is for a residential one. A poorly negotiated commercial lease can lock a business into unfavourable terms for years, with comparatively little recourse beyond what the lease itself provides. For a business, a commercial lease is often one of the largest financial commitments it will make, which is why it’s worth treating the negotiation with the same seriousness as any other major contract.

That said, commercial tenants aren’t entirely without protection. General contract law principles still apply — a commercial lease can still be challenged for misrepresentation, unconscionability, or a fundamental breach by the landlord, and courts will still interpret ambiguous language and enforce the lease as written. The difference is that there’s no statutory floor of minimum protections layered on top, which places more weight on getting the actual negotiated terms right from the outset.

Commercial rent is rarely as simple as a single monthly figure. A gross lease generally bundles most property costs into one payment, giving the tenant more budget predictability. A net lease has the tenant pay a base rent plus a proportionate share of costs like property tax, insurance and common area maintenance, billed separately. A triple net lease pushes even more of these costs onto the tenant, and is common in retail and industrial space.

Understanding which structure you’re signing up for — and getting a realistic estimate of what the additional costs are likely to be under a net or triple net structure — is essential to actually budgeting for the space. A base rent that looks attractive can become far less so once operating costs, tax escalations, and common area charges are added on top, so it’s worth asking for historical cost figures and any cap or estimate on future increases before treating the base rent as the real cost of the space.

Rent escalation clauses are also common in multi-year commercial leases, building in a fixed annual increase or one tied to an index. Confirm exactly how the escalation is calculated, whether it compounds year over year, and how it interacts with any renewal option, since an escalation clause that looks modest in year one can add up to a meaningfully higher rent by the later years of a longer lease term.

Most commercial leases include a permitted use clause, restricting what the tenant can actually operate in the space. This protects the landlord’s interest in maintaining a consistent tenant mix, but it can also restrict a tenant’s ability to pivot the business later — a narrowly worded use clause that only permits “retail sale of clothing,” for example, could become a real obstacle if the business wants to add a cafe or expand into a different product line down the road.

Retail and restaurant tenants in multi-tenant properties sometimes negotiate an exclusivity clause, preventing the landlord from leasing space to a direct competitor within the same property. Where available, this can be a meaningful protection, but it needs to be drafted carefully — defining “competitor” too narrowly can leave obvious loopholes, while defining it too broadly can create its own disputes about what other tenants are permitted to do.

A restrictive use clause can also become a problem at the point of sale or assignment. If you ever want to sell the business or transfer the lease, an overly narrow use clause can limit the pool of potential buyers to those operating a nearly identical business, reducing the value and marketability of the leasehold interest itself. Negotiating slightly broader use language, where possible, can pay off well beyond the original tenant’s own occupancy.

Commercial leases typically divide repair and maintenance responsibility between landlord and tenant in more detail than a residential lease would. It’s common for a landlord to remain responsible for the building’s structure, roof, and major systems, while the tenant takes responsibility for the interior of their own unit, including fixtures, finishes, and day-to-day upkeep — but the exact split varies significantly from lease to lease, and needs to be read carefully rather than assumed.

Operating cost clauses deserve particular attention in a net or triple net lease. Ask what costs are included, how they’re allocated among tenants in a multi-tenant property, whether there’s a cap on annual increases, and whether you have any right to review or audit the underlying cost calculations. A lease that gives the landlord broad, largely unreviewable discretion over these costs can result in significant, hard-to-predict increases over the life of the lease.

It’s also worth confirming what happens if the landlord fails to complete a repair it’s responsible for. Some leases give a tenant the right to complete an urgent repair themselves and deduct the cost from rent (a self-help remedy), while others require formal notice and a cure period before the tenant has any recourse at all. Knowing this in advance matters most in exactly the situation you’d hope never to face — a genuine emergency affecting the ability to operate.

Commercial leases often run for multiple years, sometimes with one or more renewal options. Our companion guide on commercial lease renewals and options to renew covers this in detail, including how renewal rights are typically structured and the steps needed to exercise them properly.

If a tenant plans to invest in leasehold improvements — buildout, fixtures, or renovations specific to the business — the lease should address who owns those improvements, whether the landlord contributes toward the cost (sometimes through a tenant improvement allowance), and what happens to them if the lease ends or isn’t renewed. Improvements can represent a significant investment, and a lease that’s silent on ownership and removal obligations at the end of the term can create an expensive surprise down the road.

Some tenants also negotiate a fixturing period — a period before rent formally begins during which the tenant can access the space to complete buildout and improvements. This can meaningfully reduce the upfront cost of opening a new location, but it needs to be clearly documented, including exactly what obligations (like insurance and utilities) apply to the tenant during that period even though rent hasn’t started yet.

Landlords leasing to smaller or newer businesses often ask for a personal guarantee from the business owner, making the individual personally responsible for the lease obligations if the corporate tenant defaults. This is one of the most consequential terms in a small business lease, since it can expose personal assets to a business risk that a corporate structure would otherwise help contain.

Where a personal guarantee is unavoidable, it’s worth negotiating its scope — for example, limiting it to a specific dollar amount or a defined portion of the lease term, rather than an unlimited, open-ended guarantee for the full length of the lease. Landlords won’t always agree to limit a guarantee, but it’s a reasonable point to raise, and it’s far easier to negotiate before signing than to renegotiate once the lease is in effect.

Unlike a standard residential lease, most terms in a commercial lease are genuinely negotiable, particularly for a tenant with reasonable bargaining power or a landlord eager to fill vacant space. Rent, operating cost caps, renewal terms, exclusivity, and the scope of a personal guarantee are all common points of negotiation, and a landlord’s first draft should generally be treated as a starting point rather than a final offer.

Given the length and financial significance of most commercial leases, having the document reviewed by someone experienced in commercial leasing before signing is one of the more valuable investments a business can make at this stage — the cost of a review is almost always small compared to the cost of being locked into an unfavourable term for the full length of a multi-year lease.

Before signing, it’s also worth confirming who is actually authorized to sign on behalf of each party, and getting a fully executed copy — signed by both sides — for your own records. A lease that’s only partially signed, or where authority to sign on behalf of a corporate landlord or tenant is unclear, can create avoidable uncertainty about whether the agreement is actually binding. It’s a small step, but it’s the kind of detail that only matters when something goes wrong — at which point it can matter a great deal.