Commercial Leasing 101

by CENTURY 21 United Realty Inc. Brokerage

More Than Just a Signature: Understanding Your Commercial Lease

In the world of commercial real estate, the “sticker price” is rarely the whole story. Whether you are a business owner looking for your first storefront or a REALTOR® pivoting into commercial properties, understanding the terminology is the difference between a thriving business and a financial headache.

At CENTURY 21 United Realty Inc., we believe in clarity before the contract. Here is everything you need to know about “who pays for what.”

1. The Measurement Mystery

Not all square footage is created equal. Most landlords in North America use the BOMA Standard to calculate space. This involves measuring from the outside of exterior walls to the midpoint of shared (demising) walls.

However, the most important distinction is Rentable vs. Usable Square Feet:

Usable Square Feet (USF): The literal space within your walls.
Rentable Square Feet (RSF): The space you pay for, which includes a Load Factor—a percentage of the building’s shared lobbies and hallways.

Pro Tip: In a typical office, expect to pay for 15% to 20% more space than you can actually use.

2. Decoding Lease Structures

The most important thing to understand is “who pays for what” beyond the base rent.

Gross Lease: The tenant pays a flat fee, and the landlord covers operating expenses like taxes and maintenance. This is often found in older, mixed-use buildings.
Net Lease: The tenant pays a lower base rent but covers some or all operating expenses.
Triple Net (NNN): This is the “gold standard” for retail and industrial spaces. The tenant pays base rent plus a pro-rata share of all building expenses, often referred to as TMI (Taxes, Maintenance, and Insurance) or CAM (Common Area Maintenance).

3. Protecting Your Business Flexibility

A lease is a legal roadmap for your business’s future. Two clauses often “fly under the radar” but are crucial for long-term success:

The Use Clause: This defines what you can actually do in the space. Be careful with “narrow” clauses that might prevent you from adding new products or services down the road.
Exclusivity: This prevents your landlord from leasing the unit next door to your direct competitor.

If you ever need to move before your term is up, you’ll look for Assignment or Sublease rights. An Assignment is generally preferred as it transfers the entire lease to a new party, ideally releasing you from future liability.

4. Doing the Math

How much cash do you need upfront? Typically, a deposit consists of two months’ rent plus TMI, plus HST on the total.

Example Calculation:

Space: 1,000 s.f.
Base Rent: $12/s.f.
TMI: $4/s.f.
Annual Total: $16,000 ($16/s.f. x 1,000 s.f.)
Monthly Payment: $1,333.33 + HST (Note: Utilities are usually extra).

The Bottom Line

Commercial leasing is about more than just rent—it’s about expenses, measurement standards, and legal protections. If you’re looking to navigate the Peterborough commercial market, reach out to our team at CENTURY 21 United Realty Inc. to ensure your lease supports your growth.