Ontario Commercial Property Laws: Complete Guide for Landlords and Property Owners

Commercial tenancies in Ontario are governed by the Commercial Tenancies Act (CTA), which provides a fundamentally different framework from the Residential Tenancies Act. Commercial landlords enjoy significantly more flexibility in lease terms, but the lease agreement itself becomes the primary governing document — making careful drafting essential.

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.

Key Differences: Commercial vs. Residential Tenancies

Common Commercial Lease Types

Gross Lease

• Tenant pays a flat monthly rent
• Landlord covers property taxes, insurance, and maintenance
• Simpler for tenants; landlord assumes cost risk

Net Lease (Single, Double, Triple)

Triple net (NNN) leases are the most common for commercial properties in Ontario, placing maximum cost responsibility on the tenant.

Percentage Lease

• Common in retail properties
• Tenant pays a base rent plus a percentage of gross sales above a threshold
• Aligns landlord and tenant interests for retail success

The Lease Agreement Is King

Unlike residential tenancies where the RTA overrides lease clauses, in commercial tenancies the lease agreement takes precedence over the CTA in most areas. This means:

• Almost any term can be negotiated and is enforceable
• The CTA provides default rules only where the lease is silent
• Careful legal review of commercial leases is essential

Key Commercial Lease Considerations

Permitted Use Clauses

• Define exactly what business activities the tenant may conduct
• Exclusive use clauses may prevent the landlord from renting to competitors

Assignment and Subletting

• Typically requires landlord consent (may not be unreasonably withheld, depending on lease terms)
• The original tenant may remain liable unless explicitly released

Renewal Options

• Commercial leases do not automatically renew the way residential leases do
• If a tenant remains after the lease expires without a new agreement, an overholding tenancy arises (typically month-to-month)
• Renewal options and rights of first refusal must be explicitly included in the lease

Operating Costs

• In NNN leases, operating cost clauses define what the tenant pays beyond base rent
• Tenants should ensure the right to audit operating cost statements
• Common area maintenance (CAM) charges must be clearly defined

Dispute Resolution

Commercial landlord-tenant disputes are handled through:

• Superior Court of Justice — For larger claims and eviction applications
• Small Claims Court — For disputes involving $35,000 or less in money or personal property
• Mediation and Arbitration — Increasingly used; many commercial leases include mandatory arbitration clauses

The Landlord and Tenant Board does not handle commercial tenancy disputes.

Getting Started with Commercial Compliance

Managing commercial properties in Ontario requires meticulous attention to lease terms, since the lease — not statute — is the primary source of rights and obligations. Landager helps commercial landlords track lease terms, manage multiple properties, and ensure compliance with CTA requirements.

Explore more Ontario commercial compliance topics:

• Commercial Security Deposits
• Commercial Eviction Process
• Commercial Required Disclosures
• Commercial Rent Increases
• Commercial Lease Requirements
• Commercial Maintenance Obligations
• Commercial Late Fees