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Find a Lawyer » Canada Legal Guides » Ontario Legal Guides » Toronto Legal Guides » Real Estate, Housing & Civil Disputes Toronto » Commercial Real Estate & Zoning Toronto » How to Legally Sublease Your Commercial Office Space in Toronto?

How to Legally Sublease Your Commercial Office Space in Toronto?

27 Mar 2026 5 min read No comments Commercial Real Estate & Zoning Toronto
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To legally sublease your commercial office space in Toronto, you must rigorously review your original lease and secure formal, written consent from your head landlord. Because you remain legally responsible for the monthly rent and any damages, ensuring your subtenant is financially viable is absolutely critical to protecting your business.

Business landscapes change rapidly. Perhaps your tech company in Liberty Village recently shifted to a remote-work model, leaving half of your expensive office empty. Or maybe your retail store in downtown Toronto is struggling, and you need another business to share the floor space and split the massive rent. Whatever the reason, subleasing commercial real estate is a highly effective way to mitigate your financial losses. However, you cannot simply hand over the keys and collect a cheque.

Commercial leases in Ontario are famously strict. Landlords actively protect their highly valuable property investments and want to know exactly who is operating inside their buildings. Attempting to “sneak” a subtenant into your space without following the proper legal channels is a direct breach of contract, which could result in an immediate eviction and massive financial penalties. We will guide you through the step-by-step process of legally subletting your space and how a commercial real estate lawyer ensures your company remains fully protected. 📈

Step-by-Step Process for Subleasing in Toronto

Subleasing involves creating a secondary legal relationship. The head landlord remains in charge, you become the “sublandlord,” and the new business becomes the “subtenant.” Navigating this triangle requires precise paperwork. 📄

Step 1: Reviewing the Assignment and Subletting Clause

Before you even post an ad for your space, your lawyer must review your current commercial lease. Almost every lease in Toronto contains a massive “Assignment and Subletting” clause. This section outlines the exact rules you must follow. It usually states that the landlord’s consent “shall not be unreasonably withheld,” but it also lists specific reasons they can legally say no (e.g., if the subtenant’s business competes directly with another tenant in the same plaza). You must understand these boundaries first.

Step 2: Finding and Vetting a Suitable Subtenant

Finding a business to take over your space is just the beginning. Because you are signing a sublease, you act as a middleman. If the subtenant stops paying rent or punches a hole in the wall, the head landlord will sue you for the money, not the subtenant. Therefore, you must rigorously vet the new business. Request their corporate financial statements, run a corporate credit check, and verify their commercial liability insurance. If their finances look shaky, walk away immediately. 🔍

Step 3: Drafting the Commercial Sublease Agreement

Never rely on a generic template downloaded from the internet. Your commercial law firm must draft a customized Sublease Agreement. This contract explicitly ties the subtenant to the rules of your original “head lease.” It dictates how much rent they pay to you, who handles maintenance issues, and what happens if they default. The agreement must clearly state that it is entirely conditional upon the head landlord granting their final, written approval.

Step 4: Requesting the Head Landlord’s Consent

Once the Sublease Agreement is signed conditionally, your lawyer will send a formal Request for Consent to the head landlord’s property management company. You will need to provide them with the draft sublease, the subtenant’s corporate background, and their financial records. The landlord’s own legal team will review this package. If everything is in order, the landlord will issue a formal “Consent to Sublease” document, making the arrangement 100% legal. ⚖️

How Much Does it Cost in Toronto?

Properly papering a sublease requires legal professionals. Attempting to save money by doing it yourself is incredibly risky when your business is still on the hook for hundreds of thousands of dollars in future rent.

Professional ExpenseEstimated Cost (CAD)Who Typically Pays?
Landlord’s Review Fee$1,000 – $3,000Your lease usually forces you (the original tenant) to pay the landlord’s legal fees.
Your Corporate Lawyer$1,500 – $3,500You pay for your lawyer to draft the sublease and negotiate the consent documents.
Commercial Broker Fee1/2 to 1 month’s rentYou pay the real estate agent if you used one to find the subtenant.

It is important to note that many Toronto commercial leases contain a “Profit Sharing” clause. This means if you successfully sublease the space for a higher monthly rent than what you currently pay, the head landlord may have the legal right to take 50% to 100% of that extra profit.

How Long Does the Process Take?

Finding the right subtenant on the open market can easily take several months, depending on the demand for commercial office space in your specific Toronto neighbourhood. ⌚

Once you actually find the subtenant and sign the conditional paperwork, the legal approval process is relatively quick. By law (and usually dictated by your lease), the head landlord generally has 15 to 30 days to review the financial package and either grant their formal consent or provide a valid, reasonable excuse for denying it.

Frequently Asked Questions (FAQ)

What is the difference between an Assignment and a Sublease?

In a sublease, you retain your connection to the landlord and essentially rent the space out yourself. In an Assignment, you permanently transfer your entire lease to a new business owner and walk away entirely. Subleasing is often used for a portion of the space or a short period.

Can the landlord arbitrarily refuse my subtenant?

Generally, no. In Ontario, unless your lease explicitly states otherwise, a landlord cannot “unreasonably withhold” consent. They can reject a subtenant with terrible credit or an illegal business model, but they cannot simply say no because they dislike them.

What happens if the subtenant stops paying me rent?

If the subtenant stops paying you, you are still 100% legally required to pay the full rent to the head landlord on the first of the month. You would then have to use your Sublease Agreement to sue or evict your subtenant to recover your lost money.

Can I sublease the space for more than my current rent?

It is legally possible, but most commercial leases in Toronto include strict profit-sharing clauses. This usually ensures that any extra profit generated by subleasing the space goes directly back into the landlord’s pockets, not yours.

Does the subtenant pay TMI (Taxes, Maintenance, Insurance)?

It entirely depends on how your lawyer drafts the Sublease Agreement. You can charge the subtenant a flat “Gross Rent” that includes everything, or you can require them to pay a specific percentage of the building’s fluctuating TMI operating costs.

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