Commercial Lease Assignment in Ontario: A Business Owner’s Guide

Most Ontario business owners deal with a commercial lease assignment at a high-stakes moment: a sale, a restructuring, or an exit. An assignment transfers the tenant's entire remaining interest in an Ontario commercial lease to a new tenant, usually requires the landlord's written consent (which the Commercial Tenancies Act says cannot be unreasonably withheld unless the lease expressly provides otherwise), and leaves the original tenant and any guarantor liable unless the landlord signs an express release. Those three facts drive almost every negotiation we see.

At Beganyi Law, we advise buyers and sellers on lease transfers as part of broader corporate, tax, and M&A work across Ontario. The lease often decides whether a deal closes on time. A location-dependent business without a secure lease is worth far less to a buyer, and a seller who misses a lingering guarantee can be paying someone else's rent years after closing.

With the right sequencing, you can protect the location, the price, and your post-closing exposure. If a sale or transfer is on your horizon, you can call us at +1 647-977-7749 or arrange a confidential consultation, with remote meetings available anywhere in Ontario.

Key Takeaways

• An assignment hands over the whole leasehold interest, while a sublease keeps the current tenant in the chain.
• Landlord consent should be requested early, in writing, with a complete information package.
• Releases of the original tenant and guarantors must be negotiated and documented expressly before closing.

What Transfers to the New Tenant, and How Is a Sublease Different?

A lease assignment moves the current tenant's rights and obligations for the balance of the lease term to a new tenant, who then deals directly with the landlord. Subleasing creates a new tenancy beneath the existing one. Renewal options, deposits, and other benefits pass only when the lease wording allows it.

How the Assignor and Assignee Take Part in the Transfer

The assignor is the current tenant giving up its interest. The assignee is the incoming party that steps into the tenant's position and agrees to perform the tenant's covenants going forward.

In practice, an assignment of lease is usually documented in a three-party agreement among the landlord, assignor, and assignee. The landlord consents, the assignor transfers, and the assignee assumes. Once completed, the assignee pays rent to the landlord and must comply with the use, insurance, repair, and other covenants of the commercial lease.

Two points catch owners off guard:

• The assignment covers the whole remaining interest. The assignor keeps no slice of the term.
• Assumption is a separate promise. A well-drafted agreement records the assignee's direct covenant to the landlord, which strengthens the landlord's position and often eases consent.

Assignment vs. Subleasing: Who Holds the Leasehold Interest?

With an assignment, the assignee holds the leasehold interest. With subleasing, the original tenant stays the landlord's tenant and becomes a landlord to the subtenant.

At common law, a sublease that failed to reserve at least the last day of the term risked being treated as an assignment. The Ontario Court of Appeal, relying on section 3 of the Commercial Tenancies Act, has held that a sublease can exist without that reservation where the documents show an objective intention not to assign. Clear drafting about which structure the parties intend avoids that argument entirely.

Which Lease Rights and Renewal Options Can Transfer?

Most rights tied to the premises travel with a properly consented lease transfer: the right to occupy, permitted use, and negotiated improvements. Renewal and extension options need a closer look.

Renewal clauses tend to fall into three categories:

• General wording referring to "the Tenant," which more often supports the option passing to an approved assignee.
• Expressly personal wording, making the option exercisable only by the named original tenant.
• Conditional wording, where the option survives only if specific conditions or a separate landlord approval are met.

A buyer taking a lease with a personal option may receive only the balance of the current term. When we see that wording, we raise it with the landlord during the consent discussion and, failing a fresh option, reflect the shorter occupancy period in price or conditions. Rights of first refusal, exclusivity clauses, and signage rights deserve the same review.

When Is Landlord Consent Required in Ontario?

Landlord consent is required whenever the lease restricts assignment, and nearly every Ontario commercial lease does. Ontario's provincial guidance confirms tenants can sublet or assign unless the lease prohibits it, so the lease wording controls first, with the Commercial Tenancies Act filling in protections around reasonableness.

Read the Assignment Clause and Ontario Consent Rules Together

Start with the assignment clause in the original lease agreement. Look for:

• Whether assignment requires consent, is prohibited outright, or is permitted to affiliates without consent.
• Response deadlines, notice formalities, and required information.
• Fees, recapture or termination rights, and any change-of-control definition.

Then apply section 23 of the Commercial Tenancies Act. Where a lease restricts assigning, subletting, or parting with possession, the Act implies a condition that consent will not be unreasonably withheld, unless the lease contains an express provision to the contrary. A tenant can apply to the Superior Court of Justice where consent has been unreasonably withheld.

The key words are "express provision to the contrary." A clause giving the landlord "sole and absolute discretion" can displace the statutory standard, so a quick read is not enough on commercial property leases drafted by institutional landlords.

What Information Should a Consent Request Include?

A complete, written request starts the clock and limits the landlord's ability to stall. We generally include:

1. Formal notice in the manner the lease specifies, identifying the proposed assignee by legal name.
2. The assignee's financial statements, credit information, and business background.
3. The intended use of the premises, confirming it matches the permitted use.
4. Details of any proposed guarantor.
5. A draft assignment and assumption agreement.
6. A request for an estoppel certificate confirming the lease is in good standing and rent is current.

Courts assess reasonableness on the information the landlord had, and the reasons it gave, at the time of the refusal. A thorough package makes a refusal based on "insufficient information" much harder to defend.

How Do Refusal, Delay, Recapture Rights, and Consent Conditions Affect the Deal?

The Court of Appeal's 2023 decision in Rabin v. 2490918 Ontario Inc. is the leading recent guide. A retiring dentist sought consent to assign his lease to the purchasers of his practice. The lease gave the landlord 15 days to respond. The landlord missed the deadline, then offered consent only if the lease gained a demolition clause on 24 months' notice.

The Court found the consent unreasonably withheld and ordered the assignment to proceed. Its main points for business owners:

• The tenant bears the burden of proving the refusal was unreasonable.
• Missing a lease deadline without excuse can itself amount to unreasonable withholding.
• Trading consent for a lease amendment that benefits the landlord is unreasonable. As the Court put it, a conditional consent is not a consent.
• The assignee's financial position and likelihood of default remain legitimate grounds for concern.

Conditions tied to protecting the landlord's existing position, such as a credit check, reasonable security, or a guarantee, are commonly accepted. Recapture clauses are different: a right to terminate and take back the space on receiving a request can end a deal before consent is even considered, so identify them before signing a letter of intent.

How Should the Agreement Allocate Obligations and Liability?

The lease assignment agreement should state exactly who is responsible for what, and from when. Silence in the document favours the landlord, and gaps between assignor and assignee become disputes after closing.

What Must the Assignment and Assumption Provisions Identify?

Precise identification prevents arguments about scope. The agreement should name:

• The landlord, assignor, and assignee by exact legal names.
• The lease by date, with every amendment, extension, and side letter listed.
• The premises by municipal address and unit.
• The assignment effective date.
• The assignee's covenant to perform all tenant obligations from that date.
• Whether the landlord's consent is a condition of the assignment taking effect.

A recurring problem in our files is an incomplete chain of lease documents. If a 2019 amendment changed the rent or the use clause and nobody lists it, the assignee may be assuming obligations it never priced.

Does the Original Tenant Remain Liable Without an Express Release?

Yes. The original tenant generally stays liable to the landlord for lease obligations through the remaining term, including renewals the lease contemplates, unless the landlord expressly releases it. Consent to the assignment does not, on its own, end the original tenant's covenant.

Sellers sometimes assume the purchase agreement takes care of this. It cannot: the buyer has no power to release the landlord's claim. Only a written release from the landlord does that.

Where a full release is unavailable, negotiate fallback protection:

• A release effective after a set period of clean rent payments.
• A cap limiting exposure to the current term, excluding renewals.
• Notice rights requiring the landlord to inform the original tenant of any default promptly.
• An indemnity from the assignee, ideally supported by a guarantee or security.

What Happens to Personal and Corporate Guarantees?

A guarantee is a separate contract between the guarantor and the landlord, so it generally survives an assignment unless it is specifically released. Many small and mid-sized Ontario business sellers personally guaranteed the original lease, and they remain exposed to the buyer's future defaults until the landlord agrees otherwise.

Releases come from one of three routes: the landlord agrees to release as part of consenting, a replacement guarantee from the buyer or its principal is accepted in exchange, or the guarantee contains its own release mechanism. Each requires the landlord's active agreement.

Buyers should expect to be asked for a personal or parent-company guarantee. If the landlord refuses to release the seller, both the seller's and buyer's guarantees can be in place simultaneously. Confirm the scope of any release in writing, including whether it covers obligations that arose before closing but surface later.

How Should Rent, Deposits, Arrears, and Indemnities Be Allocated?

Money items belong in a clear schedule. The usual allocation looks like this:

Year-end reconciliations of common area costs and realty taxes are easy to forget because they arrive months after closing. Agree in advance who pays or receives the adjustment. Cross-indemnities should cover each party's period of occupation, and the terms of an indemnification clause (survival, caps, and claims procedure) deserve the same attention here as in the main purchase agreement.

Which Governing Law and Signing Requirements Need Review?

For premises in Ontario, the agreement should be governed by Ontario law and the federal laws of Canada that apply there. Out-of-province buyers sometimes propose their home jurisdiction; that creates a mismatch with the lease itself.

Signing mechanics deserve a check too:

• Confirm each corporation's signing authority and whether its by-laws or a shareholder agreement require approvals.
• Review the lease for execution formalities, such as signing under seal or delivery by a specified method.
• Confirm the landlord accepts electronic signatures. Ontario's Electronic Commerce Act has treated electronic signatures as equivalent to paper for real estate documents since July 1, 2015, though the lease and the landlord's own process still govern how it receives documents.
• Where the lease is registered on title, a separate registrable notice of assignment may be needed.

How Does the Lease Transfer Fit Into a Business Sale?

The lease transfer is one workstream in the larger deal, and it should run in parallel with the purchase agreement from the letter of intent onward. When we act on buying or selling a business, the landlord's timing is frequently the factor that sets the closing date.

Why Asset Sales and Share Sales Raise Different Consent Issues

In an asset sale, the lease itself moves from the seller's company to the buyer's company, so an assignment and consent are required. In a share sale, the tenant corporation stays the same and only its owners change, so no assignment occurs.

That is why many owners consider the transaction structure, shares vs. assets, partly through the lease lens. A share sale also preserves renewal options drafted as personal to the tenant.

The trade-off is the change-of-control clause. Many commercial lease agreements treat a transfer of shares, or of effective voting control, as a deemed assignment requiring consent. In Kiryat Development Inc. v. O'Brien's Restaurants Inc., the Court of Appeal held that one 50% family group acquiring a majority interest was a change in effective voting control. Whether section 23's reasonableness requirement applies to change-of-control consents is not fully settled, which makes the exact wording decisive. Tax consequences also differ sharply between structures, so we coordinate with tax planning for business sales before recommending one.

What Lease Due Diligence Should a Buyer Complete?

A buyer should treat the lease as a core asset during due diligence. Our lease review checklist covers:

• The complete lease, every amendment, and any side letters.
• Remaining term and renewal options, including whether they are personal.
• Assignment, change-of-control, recapture, and relocation clauses.
• Demolition or redevelopment rights.
• Permitted use and exclusivity, matched to the buyer's plans.
• Rent escalations, operating cost structure, and recent reconciliations.
• Repair, restoration, and end-of-term removal obligations.
• An estoppel certificate confirming good standing, rent paid, and no undisclosed defaults.

The estoppel certificate is the landlord's own statement of the tenancy's condition. If it contradicts what the seller has said, the buyer learns it before money changes hands, and the landlord is restricted from later asserting undisclosed defaults. Seller statements about the lease should also be backed by specific representations and warranties.

Make Required Consent and Agreed Releases Conditions of Closing

Landlord consent belongs in the purchase agreement as a condition of closing. Closing without it can leave the buyer occupying space with no legal right to hold it and the seller in breach of its lease.

Each side should protect its own interest:

• Buyers condition closing on written consent on acceptable terms, plus a satisfactory estoppel certificate and, where needed, a new or confirmed renewal right.
• Sellers condition closing on a written release of the seller's covenant and any personal guarantee, if that release is essential to them.

The agreement should also say who pays the landlord's consent fees and legal costs, what conditions on consent the buyer must accept, and a deadline after which either party can terminate. On the sell side, raising releases at the letter of intent stage gives far more leverage than raising them the week before closing.

Coordinate the Effective Date, Insurance, Possession, and Closing Adjustments

The assignment effective date should match the closing date and time of the business sale exactly. A mismatch leaves a window where neither party is clearly responsible.

On closing day, line up these items:

• Insurance: The buyer's policy, naming the landlord as additional insured if the lease requires, must be bound from the effective date and evidenced to the landlord.
• Possession: Keys, access cards, alarm codes, and utility accounts transfer at the same moment.
• Adjustments: Prorated rent, deposits, and prepaid amounts appear on the statement of adjustments, alongside any working capital adjustment.
• Documents: Signed landlord consent, the assignment and assumption agreement, any guarantee releases, and new guarantees are exchanged in escrow and released together.

Secure Consent and Clarify Liability Before Closing

A smooth commercial lease transfer comes down to two tasks finished before closing: obtaining written landlord consent on terms both parties can accept, and documenting exactly where lease obligations sit afterward.

Consent is the gating item. Request it early, in the form the lease requires, with complete financial and business information on the assignee. Ontario law protects tenants against unreasonable refusals, delays, and consent offered only in exchange for landlord-friendly amendments, but the lease wording and the information package shape how strong that protection is in practice.

Liability is the item sellers most often underestimate. Without an express release, the original tenant and any guarantor stay on the hook for the remaining term. The lease assignment agreement should name every lease document, set the effective date, allocate rent, deposits, arrears, and reconciliations, and include cross-indemnities backed by real security.

In a business sale, build both items into the purchase agreement as closing conditions, decide early whether a share or asset structure suits the lease, and complete lease due diligence before the price is fixed. If you are preparing to buy, sell, or restructure a business with leased premises, our team can review the lease and coordinate consent alongside the transaction and tax planning.

Frequently Asked Questions

Can an Ontario commercial landlord charge a fee for reviewing an assignment?

Yes, when the lease provides for it, and many leases allow a reasonable administrative fee plus the landlord's legal costs. Who ultimately bears that cost between buyer and seller is a negotiated term of the purchase agreement. A demand for a payment or benefit beyond what the lease permits, as the price of consent, risks being found unreasonable.

Does landlord consent automatically release the original tenant or guarantor?

No. Consent permits the transfer, while the original tenant's covenant and any separate guarantee continue unless the landlord signs an express written release. Sellers should negotiate the release alongside consent and make it a closing condition if it matters to them.

Can a commercial landlord increase the rent when a lease is assigned?

The assignee takes the lease on its existing terms, so the rent stays as written unless the lease itself provides otherwise. The Court of Appeal in Rabin held that conditioning consent on a lease amendment benefiting the landlord is unreasonable, which would include an unearned rent increase. The Commercial Tenancies Act does not regulate rent levels, so any increase must come from the lease or a voluntary agreement.

Does selling shares in the tenant corporation require landlord consent?

A share sale does not assign the lease, because the tenant corporation stays the same. Many leases contain a change-of-control clause that treats a share transfer as requiring consent or notice, and breaching it can trigger default remedies. Review the lease's definition of control before signing a share purchase agreement.

Can a commercial lease assignment be signed electronically in Ontario?

Yes, Ontario's Electronic Commerce Act has recognized electronic signatures for real estate documents since July 1, 2015. Check the lease for execution or delivery formalities and confirm the landlord's process before relying on e-signatures for the consent and assignment documents.