Signing a commercial lease in the Greater Toronto Area is one of the most significant financial commitments your business will make. Yet many tenants — from first-time startups in Toronto’s Financial District to established manufacturers relocating to Barrie — don’t fully understand the difference between an NNN lease and a gross lease until it’s too late.
After more than 25 years helping businesses navigate commercial real estate across the GTA, I’ve seen how the wrong lease structure can cost tens of thousands of dollars over a term. Here’s what you need to know before you sign.
What Is a Gross Lease?
A gross lease — sometimes called a full-service lease — is the simpler of the two structures. Your landlord quotes a single monthly rate, and that figure is intended to cover base rent plus operating costs such as property taxes, building insurance, and common area maintenance.
For tenants, the appeal is predictability. A startup leasing office space in downtown Toronto or a professional firm opening a practice in Vaughan often prefers a gross lease because it simplifies budgeting. You know what you’re paying each month.
However, gross leases in the GTA market often come with escalation clauses. After the first year, landlords typically increase the operating cost component annually. Read the fine print — that “all-inclusive” rate can rise faster than you expect.
What Is a Triple Net (NNN) Lease?
A triple net lease shifts most of the property’s operating costs to the tenant. You pay base rent to the landlord, plus your proportional share of property taxes, building insurance, and maintenance costs — the “three nets.”
NNN leases are the dominant structure for industrial and retail properties across Mississauga, Vaughan, and the Barrie corridor. If you’re leasing warehouse space along Highway 400 or a retail unit in a Mississauga plaza, you should expect an NNN structure.
The base rent on an NNN lease typically appears lower than a gross lease rate, but the total occupancy cost — base rent plus TMI (taxes, maintenance, insurance) — is what matters. I’ve seen tenants in Simcoe County focus only on the base rate, only to discover that TMI added a substantial premium they hadn’t budgeted for.
Which Lease Type Is Right for Your Business?
There is no universally better option. The right choice depends on your business type, risk tolerance, and the specific property.
Choose a gross lease if:
- You need predictable monthly costs for budgeting
- You’re a small business or professional services firm leasing office space
- You prefer a single point of accountability for building operations
Choose an NNN lease if:
- You want visibility into exactly what you’re paying for
- You’re leasing industrial or retail space where NNN is market-standard
- You plan to negotiate caps on operating cost increases (always recommended)
The Negotiation Advantage
Whichever structure you encounter, the terms are negotiable. This is where most tenants leave money on the table.
With NNN leases, I always negotiate an operating cost cap — a ceiling on how much TMI can increase year over year. Without it, a landlord can pass through unexpected costs without limit. I also review the landlord’s operating expense statements carefully; in some cases across the GTA, tenants have been overcharged for costs that should have been absorbed by the landlord.
With gross leases, I focus on limiting escalation percentages and ensuring that the definition of “operating costs” is clearly defined in the lease. Vague language benefits the landlord, not the tenant.
Common Mistakes I See
Over 25 years in this market, the most expensive mistakes tenants make include:
- Comparing gross rates to NNN base rates directly — always compare total occupancy costs
- Not budgeting for year-one TMI reconciliations — these can arrive as surprise invoices
- Assuming the landlord’s standard lease is non-negotiable — everything is negotiable with the right representation
- Signing without understanding the distinction between TMI and additional rent — these terms vary by landlord and can have different inclusions
The Bottom Line
Whether you’re leasing office space in Toronto, industrial space in Mississauga, or a retail unit in Barrie, understanding your lease structure is the foundation of a good deal. The lease type determines your total cost, your risk exposure, and your negotiating leverage.
About the Author
Allen Mayer is a Commercial Real Estate Broker with RE/MAX Ultimate Realty Inc., bringing over 25 years of experience helping tenants and landlords across the Greater Toronto Area. From downtown Toronto office towers to industrial parks in Barrie and Simcoe County, Allen provides strategic lease negotiation and market advisory services.
📞 Contact Allen Mayer for a complimentary initial consultation:
Phone: (416) 992-9141
Email: allen@allenmayer.ca
Website: allenmayer.ca/contact
Frequently Asked Questions
What is the difference between an NNN lease and a gross lease in Ontario?
A gross lease bundles base rent and operating costs into one monthly payment, while an NNN (triple net) lease charges base rent separately from property taxes, insurance, and maintenance. NNN leases are more common for industrial and retail properties across the GTA, including Mississauga, Vaughan, and Barrie.
Can I negotiate the lease structure with a landlord?
Yes. Whether you’re offered a gross or NNN lease in Toronto or anywhere in the GTA, the terms — including operating cost caps, escalation limits, and what’s included in TMI — are fully negotiable with proper broker representation.
Which lease type is better for a small business in the GTA?
It depends on your business type and budget. Small professional services firms often prefer gross leases for predictability, while retailers and industrial tenants typically encounter NNN leases. The key is comparing total occupancy costs, not just the base rent.
What does TMI mean in a commercial lease?
TMI stands for Taxes, Maintenance, and Insurance — the three operating cost components added to base rent in an NNN lease. In markets like Mississauga, Vaughan, and Barrie, TMI can significantly impact your total monthly cost and should be carefully reviewed before signing.