Ontario Commercial Lease Requirements: Key Clauses, NNN Leases, and Negotiation

Ontario commercial leases are freely negotiated between the parties. Unlike residential leases, there is no mandatory government-prescribed form, and the Commercial Tenancies Act (CTA) provides only default rules that apply where the lease is silent. The lease document is therefore the most important instrument governing the landlord-tenant relationship.

Disclaimer: This guide provides general legal information for educational purposes only and does not constitute legal advice. Always consult a licensed attorney in Ontario for guidance specific to your situation. Information last verified: March 2026.

No Standard Form Required

Unlike residential tenancies where the Ontario Standard Lease is mandatory, commercial leases:

• Have no prescribed form — landlords create their own
• Are typically drafted by the landlord's lawyer and negotiated with the tenant
• Range from simple one-page agreements to complex multi-page documents
• Must comply with general contract law principles

Essential Lease Clauses

Every commercial lease should address these fundamental elements:

1. Parties and Premises

• Full legal names of landlord and tenant (including corporate names)
• Exact description of the leased premises (unit number, square footage, common areas included)
• Any parking, storage, or exclusive areas

2. Term, Renewal, and Commencement

3. Rent Structure

• Base rent — Amount, payment schedule (monthly in advance), escalation method
• Additional rent — Operating costs, property taxes, insurance (for NNN leases)
• Percentage rent — If applicable (retail leases)
• Rent-free periods — Common incentive for new tenants

4. Permitted Use

• Defines exactly what business the tenant may operate
• Exclusive use clauses — May prevent the landlord from renting to competitors
• Continuous operation clauses — Require the tenant to remain open and operating
• Zoning compliance is typically the tenant's responsibility to verify

5. Maintenance and Repairs

• Clearly allocate responsibility between landlord and tenant
• Structural repairs typically remain with the landlord
• Interior and non-structural repairs are often the tenant's responsibility
• See our Commercial Maintenance Obligations guide

6. Insurance Requirements

7. Assignment and Subletting

• Commercial leases typically require landlord consent for assignment or subletting
• The landlord may not unreasonably withhold consent (this is implied unless the lease explicitly says otherwise)
• In some leases, the landlord may recapture the space instead of consenting
• The original tenant may remain liable for the full lease term unless explicitly released

8. Termination and Default

• Define what constitutes a default (non-payment, breach of covenants, insolvency)
• Specify cure periods — time allowed to remedy a default before the landlord takes action
• Outline landlord remedies (re-entry, distress, acceleration of rent, damages)
• Include tenant remedies if the landlord defaults

9. Improvements and Alterations

• Landlord's consent typically required for any alterations
• Tenant improvements (TIs) — Who pays, who owns them, and what happens at lease end
• Leasehold improvement allowance (TIA) — Landlord contribution to build-out costs
• Restoration obligations — Whether the tenant must restore the premises to original condition

10. Demolition Clause

• Allows the landlord to terminate the lease early for redevelopment
• Typically requires 6-12 months' notice
• May include compensation to the tenant (negotiable)

Offers to Lease

Before executing a full lease, parties often sign an Offer to Lease (also called Letter of Intent or Heads of Terms):

• Outlines the key commercial terms (rent, term, use, tenant improvements)
• May be binding or non-binding depending on the language
• Typically includes an exclusivity period during which the landlord will not negotiate with other tenants for that space
• The full lease is then drafted based on the agreed terms

Lease Registration

• Commercial leases with a term of more than 7 years (including renewal options) should be registered on title at the Land Registry Office
• Registration protects the tenant's interest if the property is sold
• Shorter leases are typically enforceable against a new owner under the CTA, but registration provides additional security
• A Notice of Lease can be registered instead of the full lease to maintain confidentiality

Best Practices for Ontario Commercial Landlords

1. Use experienced legal counsel — Commercial leases are complex; template leases often miss critical issues
2. Address all key areas — Gaps in the lease create default rules that may not favour the landlord
3. Negotiate in good faith — Balanced leases lead to longer, more stable tenancies
4. Include detailed definitions — Define "operating costs," "base rent," "premises," and other key terms precisely
5. Update regularly — Review and update lease templates to reflect current law and market conditions
6. Document everything — Side agreements, amendments, and consents should always be in writing

How Landager Helps

Landager helps commercial landlords manage lease terms, track critical dates (renewals, escalations, option exercise deadlines), and organize lease documents — streamlining your portfolio management.

Back to Ontario Commercial Property Laws Overview.