Many commercial tenants focus heavily on the advertised rental rate when searching for industrial, office, or retail space.

However, in Ontario commercial real estate, the “base rent” is often only one portion of the tenant’s total occupancy cost.

One of the most common lease structures in commercial real estate is the Triple Net Lease — often referred to as a:

• “NNN Lease,”
• “Net Lease,”
• or “Triple Net Lease.”

Understanding how triple net leases work is extremely important because additional costs can significantly affect:

• cash flow,
• operating expenses,
• business profitability,
• and long-term occupancy affordability.

Before signing a commercial lease in Oshawa, Durham Region, or elsewhere in Ontario, tenants should carefully understand the financial and operational obligations associated with triple net leasing.

What Is a Triple Net Lease?

In a triple net (NNN) lease, the tenant typically pays:

• base rent,
  PLUS
• additional operating costs associated with the property.

These additional costs often include:

• property taxes,
• building insurance,
• and common area maintenance expenses.

This is why the lease is referred to as “triple net.”

However, many Ontario commercial leases may also include numerous additional charges beyond these basic categories.

Base Rent vs. Additional Rent

One of the biggest misunderstandings in commercial leasing involves the difference between:

• base rent,
  and
• additional rent.

Base Rent

Base rent is the fixed rental amount typically quoted:

• per square foot,
• per month,
• or annually.

Additional Rent

Additional rent may include a variety of recoverable operating expenses such as:

• property taxes,
• insurance,
• snow removal,
• landscaping,
• parking lot maintenance,
• utilities,
• management fees,
• common area maintenance,
• HVAC servicing,
• security,
• and repair costs.

In some properties, additional rent can represent a substantial portion of the total occupancy cost.

A tenant focusing only on base rent may significantly underestimate the true financial commitment.

How Additional Rent Is Calculated

Additional rent is often allocated proportionately based on:

• rentable area,
• usable area,
• or tenant share of the building.

Tenants should carefully review:

• how costs are allocated,
• historical operating cost statements,
• reconciliation procedures,
• management fees,
• and year-over-year increases.

Some leases may also allow landlords to pass through:

• capital expenditures,
• administrative fees,
• or repair costs under certain circumstances.

Understanding these calculations is essential before signing the lease.

Why Landlords Use Triple Net Leases

Triple net structures help landlords:

• stabilize investment returns,
• reduce operating risk,
• and transfer certain property costs to tenants.

From a landlord perspective, NNN leases create:

• more predictable net income,
• reduced exposure to tax increases,
• and lower operational volatility.

Triple net leasing is particularly common in:

• industrial properties,
• multi-tenant commercial buildings,
• retail plazas,
• and investment-grade commercial assets.

What Commercial Tenants Should Review Carefully

Historical Operating Costs

Tenants should request:

• prior operating cost statements,
• tax history,
• insurance costs,
• and maintenance summaries where available.

This helps identify:

• unusual increases,
• deferred maintenance,
• or operating cost trends.

HVAC and Repair Responsibilities

Commercial leases often transfer repair obligations to tenants.

Tenants should determine responsibility for:

• HVAC systems,
• plumbing,
• electrical systems,
• lighting,
• and specialized equipment.

Unexpected repair obligations can create substantial unplanned expenses.

Property Tax Exposure

Commercial property taxes can fluctuate significantly depending on:

• reassessment,
• property improvements,
• municipal tax changes,
• or occupancy changes.

Tenants should understand how tax increases may affect occupancy costs over time.

Capital Expenditures

Some leases permit landlords to recover portions of major building improvements or capital repairs through operating cost allocations.

Tenants should carefully review:

• what qualifies as recoverable,
• amortization provisions,
• and cost limitations.

This area often creates misunderstandings during lease negotiations.

Industrial Tenants May Face Additional Operational Costs

Industrial leases may also involve operational expenses relating to:

• loading facilities,
• truck courts,
• heavy electrical service,
• specialized ventilation,
• outdoor storage,
• sprinkler systems,
• or environmental compliance.

Certain industrial uses may create:

• higher utility demands,
• increased insurance costs,
• or additional maintenance obligations.

Operational suitability should be reviewed carefully before occupancy.

Lease Negotiation Matters

Commercial leases are highly negotiable.

Tenants may be able to negotiate:

• operating cost caps,
• exclusions,
• repair responsibilities,
• escalation limits,
• renewal options,
• inducements,
• or improvement allowances.

Strong lease negotiation is often about:

• reducing long-term risk,
  not simply:
• reducing initial rent.

Well-structured leases can significantly improve operational predictability and long-term occupancy stability.

Unexpected Occupancy Costs Can Hurt Businesses

One of the biggest risks in commercial leasing is occupancy cost uncertainty.

Businesses sometimes underestimate:

• operating cost increases,
• tax escalation,
• maintenance exposure,
• or deferred repair obligations.

These unexpected costs can:

• strain cash flow,
• reduce profitability,
• or create operational stress.

Careful lease review helps businesses make more informed occupancy decisions.

Triple Net Leases Are Not “Bad”

Triple net leases are extremely common in Ontario commercial real estate.

The key issue is not whether the lease is “good” or “bad,” but whether the tenant:

• understands the obligations,
• properly evaluates occupancy costs,
• and structures the lease appropriately for the business.

Well-negotiated NNN leases can provide:

• long-term stability,
• operational flexibility,
• and predictable occupancy arrangements.

Final Thoughts

Triple net leases involve much more than simply paying monthly rent.

Commercial tenants should carefully review:

• operating costs,
• repair obligations,
• tax exposure,
• lease structure,
• and long-term occupancy risk before signing.

Professional commercial real estate advisory can help tenants:

• understand lease structure,
• identify hidden risks,
• negotiate more effectively,
• and align occupancy decisions with long-term business objectives.

Before signing a commercial lease, tenants should also consider obtaining appropriate legal, accounting, insurance, and operational advice relevant to their business and occupancy requirements.

Written by Rodney Harvey, Broker of Record at Konfidis, Brokerage providing advisory-focused commercial, industrial, investment, and real estate brokerage services across Oshawa, Durham Region, and Ontario.