What the lease says about assignment
Start with the lease itself. Most commercial leases prohibit assignment, subletting or a change of control of the tenant without the landlord's prior written consent, set out the information the landlord can require, allow the landlord to charge its legal costs, and sometimes give the landlord a right to terminate the lease instead of consenting. Some say the original tenant remains liable after assignment; many require the assignee to sign a direct covenant with the landlord.
Also read the term and renewal options. A business with two years left on its lease and no renewal right is a different purchase from one with ten years secured, and lenders price that difference.
What the Commercial Tenancies Act adds
Section 23 of the Commercial Tenancies Act reads a proviso into most leases: where the lease requires the landlord's consent to assign, that consent is not to be unreasonably withheld, unless the lease expressly says otherwise. What is unreasonable depends on the facts; a landlord may legitimately look at the buyer's financial strength, experience and intended use, and may impose conditions such as a guarantor or a deposit.
The Act also lets a tenant apply to court where consent is refused. In practice that is slow and expensive, so the better route is to give the landlord a complete application early and a closing date that leaves time to answer.
Assignment, a new lease, or a share deal
An assignment transfers the existing lease to you with its remaining term, options and rent. A new lease resets the terms and can be better or worse; landlords sometimes use the request as a chance to raise rent or remove options. In a share purchase the tenant does not change, so no assignment is needed, but most modern leases treat a change in control of the tenant as an assignment requiring consent.
If the business is a franchise the franchisor may hold the head lease and sublet to the franchisee, in which case both landlord and franchisor consents are required.
Guarantors, indemnifiers and the seller's release
Landlords usually ask the buyer, and often its principals personally, to stand as guarantor of the lease. The seller, meanwhile, wants a release from its own covenants and any role as guarantor; unless the landlord agrees in writing, the seller often stays liable after assignment. A landlord release letter is therefore a common seller deliverable, and negotiating it can slow consent.
Ask for an estoppel certificate in which the landlord confirms the rent, the term, the deposit held and that there are no defaults. It is the only reliable way to learn about arrears or disputes before you inherit them.
Timing and the closing condition
The purchase agreement should make landlord consent a condition of closing, say who applies, who pays the landlord's costs, and what happens if consent is refused or comes with unacceptable conditions. Send the landlord a full package early: financial statements or a personal net worth statement, a resume, the business plan and the proposed guarantor. Leases commonly give the landlord a set number of days to respond, and lenders will not fund without the consent letter in hand, so the request usually goes out in the same week as the financing application.
We draft the consent condition in the purchase agreement, prepare the landlord's package, and chase the estoppel certificate so financing and closing stay on schedule.
Your steps
Who's involved
Decides on consent, sets conditions and signs the consent, estoppel and any new guarantor agreement.
Handles the application, information requests and lease administration for the landlord.
Reviews the lease, prepares the assignment and assumption agreement and negotiates consent terms.
Applies for consent under the lease and seeks a release of its own obligations.
Documents you will need
Tools for this stage
Enter your target closing date to see when each stage typically needs to happen for a small business purchase. Consents and licences set the pace. Treat the dates as a guide, not a fixed schedule.
Checklist builderWhat should I ask the seller for?Answer a few questions about the deal and this builds the document request list to send the seller in the first week of exclusivity. It is a starting list, not a substitute for reading the documents yourself.
Guides to download
Questions people ask
Can the landlord refuse consent to the assignment?
Only on reasonable grounds, unless the lease expressly removes that protection. Reasonable grounds usually relate to the buyer's financial standing, experience or proposed use. A refusal aimed at extracting higher rent or a termination is more open to challenge, and the Commercial Tenancies Act lets a tenant apply to court.
Does a share purchase avoid the need for landlord consent?
Not usually. Although the tenant corporation does not change, most commercial leases define a change in control of the tenant as an assignment requiring consent. Read the definition in your lease before assuming otherwise.
Can the landlord charge a fee for consenting?
Leases commonly allow the landlord to recover its reasonable legal and administrative costs. A fee beyond that is a matter of what the lease says and what you are prepared to pay to close.
Is the seller still liable after the lease is assigned?
Often yes, under the original covenant and any role as guarantor, unless the landlord releases them. That is the seller's problem in law, but it can become yours if the seller's insistence on a release delays consent.
What if the lease expires soon after closing?
Negotiate an extension or a new lease as a closing condition, or price the risk. Lenders often require the lease term, including options, to run at least as long as the loan.
Also in this centre
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Related centres
Other Learning Centres for the same transaction.
Sources
General information about Ontario law as of 5 September 2026, not legal advice. It does not create a lawyer–client relationship.
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