Signing a commercial lease is one of the most significant financial commitments a business will make. Yet many tenants rush through the process without fully understanding the terms, leaving themselves exposed to unnecessary costs and operational constraints. As a commercial real estate broker here in Montreal, I’ve seen how costly these oversights can be. Here are the five most common mistakes I encounter when tenants sign a lease—and how to avoid them.
1. Failing to Understand Lease Structure
One of the biggest mistakes is not clarifying whether you’re signing a gross lease, net lease, or triple net (NNN) agreement. These aren’t just semantic differences—they fundamentally change your actual occupancy costs.
Under a gross lease, the landlord covers most operating expenses. With a net lease, you pay base rent plus a portion of property taxes and insurance. A triple net lease means you’re responsible for taxes, insurance, and maintenance. Many tenants focus only on the headline rental rate and overlook these additional obligations, which can easily add 20–40% to your true annual cost. Before you sign, request a detailed breakdown of all expenses you’ll be responsible for.
2. Skipping the Due Diligence Phase
I can’t stress this enough: don’t skip due diligence. Many tenants sign without conducting a thorough inspection, reviewing the building’s condition, or verifying zoning restrictions. You should verify that the space is properly zoned for your intended use and that municipal regulations won’t restrict your operations down the line. Also, confirm the building’s structural integrity, HVAC systems, and any pending capital improvements. A professional inspection costs far less than discovering problems after you’ve signed.
3. Ignoring Lease Term and Renewal Options
Tenants often accept whatever lease term the landlord proposes without negotiating renewal options or extension terms. This is a tactical error. In today’s Montreal market, where industrial space rents have increased to $12.50 per square foot net—up 8% year-over-year—locking in favorable renewal terms now protects you from future rate spikes. Ensure your lease includes renewal options at predictable rates, or at minimum, a right of first refusal so you can match any competing offer.
4. Overlooking Tenant Improvement Allowances
Landlords often provide tenant improvement (TI) allowances to offset fit-out costs. Many tenants either don’t ask for this or accept inadequate amounts without negotiation. In a competitive market, this is one of the few levers you have to reduce your capital outlay. Request a detailed TI budget upfront, get it in writing, and ensure the lease specifies what happens if costs exceed the allowance. Don’t leave money on the table.
5. Not Seeking Professional Advice
This is perhaps the most avoidable mistake. Tenants sometimes avoid hiring a broker or lawyer to "save money," only to lock themselves into unfavorable terms for five, ten, or fifteen years. The cost of professional guidance is negligible compared to the financial exposure of a poorly negotiated lease. A broker can help you understand market conditions, benchmark rates, and negotiate terms that align with your business needs.
Moving Forward
The Montreal commercial real estate market is active and dynamic. Whether you’re looking at industrial, office, or retail space, understanding what you’re signing matters. Take the time to review every clause, ask questions, and ensure you’re not making these common mistakes.
If you’re planning a lease negotiation or need guidance on commercial real estate decisions, we’re here to help. Contact Immodev Montréal to speak with a broker who understands the Greater Montreal and South Shore markets. Let’s ensure your next lease works for your business.