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Reviewing Commercial Leases During Due Diligence on an Ontario Business

Find out what to check in an Ontario commercial lease before buying a business: assignment consent, renewal rights, landlord approval and what to ask for.

Buying & Selling a Business4 min readTSLBy the Treadstone Law Team · OntarioUpdated November 13, 2026
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Key takeaways
  • For a storefront or office-based business, the lease can be as valuable as the business itself, so read it before you commit.
  • Whether the landlord must approve the deal depends on the lease wording, so confirm it with a lawyer early.
  • Taxable leases and licences can still carry GST/HST even if a Form GST44 election is made on the sale.

If the business you want to buy operates from a leased storefront or office, the right to stay in those premises may be the most important thing you are buying. A great customer list means little if you cannot keep the location.

This article explains what to look for in the lease during due diligence. The lease wording controls, so a lawyer should read the actual document before you sign anything.

Get the whole lease and the paper trail

Ask the seller for the signed lease and every document that changes it: amendments, renewals, side letters, notices from the landlord and any earlier assignment. A summary from the seller is not enough.

Assignment and landlord consent

If you buy the business assets, the seller usually needs to transfer the lease to you, which is called an assignment. Many leases require the landlord's consent first. Read the clause that deals with assignment, subletting and a change of control, since some leases treat a share sale as a transfer too.

Whether the landlord can refuse consent, charge a fee, or ask for a new guarantee or deposit depends on the lease wording and the circumstances. Your lawyer can advise on that. Do not assume consent will be given.

Make landlord consent a condition of closing in the purchase agreement, so you are not bound to buy a business you cannot operate from its location.

Term, renewal and rent

Check how much time is left on the lease. A short remaining term can leave you with a business and no secure location. Find out whether there is a renewal option, how it is exercised, and how the renewal rent is set.

If a taxable lease or licence is part of the deal, GST/HST can still apply to it even where the buyer and seller make a Form GST44 election on the sale of the business. Ask your accountant how this affects you.

Use, alterations and condition of the premises

Confirm the lease allows your intended use, including signage and any exclusive-use or competing-tenant restrictions. Ask who owns the fixtures and leasehold improvements, and what must be restored at the end of the term.

Visit the premises. Compare what you see with the lease, look for repairs, and check that required permits and insurance are in place. Equipment on the premises can be subject to a lender's security, so run the searches described in our lien search article before closing.

What to do next

Frequently asked questions

Do I need the landlord's consent to take over the lease?

It depends on the lease. Many leases require consent to an assignment, and some also address a change of control. Have your lawyer read the clause and approach the landlord early.

Can I buy the business if the landlord refuses?

You may be able to, but you might not be able to keep the location. That is why buyers usually make landlord consent a condition of closing, so they can walk away if it is not given.

Does a renewal right pass to me with the lease?

That depends on how the renewal clause is written and on the assignment terms. Check whether the renewal option is personal to the original tenant and ask your lawyer to confirm.

Does GST/HST apply to a lease in a business sale?

It can. Even with a Form GST44 election, GST/HST still applies to a taxable supply of property by lease or licence. Your accountant can confirm how it applies to your situation.

Sources

Links go to official government, court and regulator pages. The law changes — confirm you are reading the current version.

This article is general information, not legal advice. Reading it does not create a lawyer-client relationship. Ontario laws, tax rates, and government programs change, and how the law applies depends on your specific facts. For advice about your situation, speak with a licensed Ontario lawyer. Treadstone Law is licensed by the Law Society of Ontario — reach us at 1-844-900-1070 or start a file online.

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