Shopping for commercial space means decoding an alphabet soup of lease types. Two of the most common, double net and triple net, sound nearly identical. The difference between them decides who pays for the roof over your head, literally.
Both structures ask tenants to pay base rent plus a share of property operating expenses. The split between landlord and tenant responsibilities is where they diverge, and that split can shift tens of thousands of dollars per year from one party to the other.
This guide breaks down double net and triple net leases side by side, explains what tenants pay under each, and shows you how to choose the right structure for your business.
The Basics: What Net Leases Share
All net leases separate base rent from operating expenses. Instead of one all inclusive payment, the tenant pays a lower base rent plus some or all of the costs of running the property. This is the opposite of a gross lease, where the landlord bundles everything into a single figure.
The appeal for landlords is protection against rising costs. Property taxes and insurance climb over time, and net leases pass those increases to tenants automatically. For tenants, the trade off is a lower starting rent in exchange for less predictable total costs.
Net leases dominate retail and industrial properties. Office buildings more often use gross or modified gross structures, though net leases appear there too. Knowing which type you are signing is the first step in evaluating any commercial offer.
Double Net Leases Explained
In a double net lease, usually written as NN, the tenant pays base rent plus two of the three main operating expenses: property taxes and building insurance. The landlord remains responsible for maintenance and common area costs.
This middle ground structure is common in multi tenant retail centers and office buildings. The landlord handles the shared spaces, parking lots, and building systems, while tenants cover the tax and insurance bills that fluctuate with the market.
Double net leases give tenants moderate cost exposure. Taxes and insurance are relatively stable compared to maintenance, which can spike when major systems fail. Landlords like them because they shed two volatile cost categories while keeping control of the building’s physical condition.
Triple Net Leases Explained
A triple net lease, written as NNN, adds the third expense category: maintenance. The tenant pays base rent plus property taxes, building insurance, and maintenance costs. In multi tenant buildings, these are typically allocated by square footage.
Maintenance under a triple net lease usually covers common areas, landscaping, parking lots, and building systems like HVAC and elevators. The landlord still handles structural elements such as the roof and foundation, which is the key line separating triple net from absolute net leases.
Triple net is the standard for retail properties across the United States. Landlords favor it because it creates highly predictable net income. Tenants accept it because base rents run lower than in gross lease buildings, and single tenant occupants gain control over maintenance decisions.
Side by Side Comparison
The clearest way to see the difference is to line up who pays for what under each structure.
Base rent goes to the landlord in both cases. This is the starting point of every comparison, and it is usually quoted per square foot per year.
Property taxes fall on the tenant in both double net and triple net leases. Expect this to be the largest pass through expense, sometimes adding thirty percent or more to your base rent.
Building insurance is also the tenant’s responsibility in both structures. The landlord sets minimum coverage requirements, and the tenant pays the premiums.
Maintenance and common area maintenance are where the two diverge. In a double net lease, the landlord pays. In a triple net lease, the tenant pays. This single difference is the entire distinction between NN and NNN.
Structural repairs and capital expenditures generally stay with the landlord under both structures. Roof replacement, foundation work, and major structural repairs are the owner’s burden unless the lease specifically shifts them, which would push the deal toward absolute net territory.
What Tenants Pay in Practice
Labels tell only part of the story. Real leases contain details that change the economics significantly, and tenants should evaluate the total occupancy cost rather than the base rent alone.
Ask for the property’s operating history. Three years of tax bills, insurance premiums, and maintenance records reveal what you will actually pay. A triple net lease on a well maintained newer building can cost less overall than a double net lease on an aging property with deferred maintenance.
Understand the allocation method. In multi tenant buildings, expenses are usually divided by rentable square footage, but some leases use different formulas for different categories. A tenant occupying ten percent of the space should generally pay about ten percent of shared costs.
Watch the base year mechanics. Some net leases include a base year so tenants only pay increases above the first year’s expenses. Others pass through the full amount from day one. The difference changes your first year costs dramatically.
Which Structure Costs Less?
Neither structure is inherently cheaper. The better deal depends on the building, the market, and how each side prices the risk.
Compare effective rent, not base rent. Add the estimated pass through expenses to the base rent for each option you are considering. A double net lease at eighteen dollars per square foot with four dollars in pass throughs costs the same as a triple net lease at fourteen dollars with eight dollars in pass throughs.
Consider who manages maintenance better. If the landlord runs an efficient maintenance operation, a double net lease lets you benefit from their scale. If you operate a single tenant building and can maintain it cheaply yourself, triple net gives you control and potential savings.
Factor in predictability. Double net leases shield you from maintenance surprises, which makes budgeting easier. Triple net leases expose you to cost spikes but reward efficient management. Choose based on your risk tolerance and cash reserves.
Negotiating Protections in Net Leases
Whatever structure you choose, certain lease provisions protect tenants from unpleasant surprises. Push for these during negotiation.
Cap controllable expenses. Many sophisticated tenants negotiate annual caps on the growth of controllable operating expenses, often around five percent. This prevents the landlord from passing through runaway cost increases while still allowing taxes and insurance to float.
Watch escalation clauses. Even in double net leases where the landlord handles maintenance, rising operating costs interact with rent escalation clauses to push your total occupancy cost higher each year. Model the combined effect before signing.
Exclude capital expenditures. Make sure the lease distinguishes routine maintenance from capital improvements. Without clear language, a landlord might pass through the cost of a new HVAC system as maintenance. Define the boundary explicitly.
Negotiate gross up provisions. In partially vacant buildings, expenses should be calculated as if the building were fully occupied, usually at ninety five percent. Without a gross up clause, the remaining tenants absorb costs that vacant space should have shared.
Common Pitfalls to Avoid
Net leases contain traps for tenants who focus only on the base rent figure. These are the mistakes to avoid.
Ignoring the total occupancy cost is the most expensive error. A triple net lease with a low base rent can exceed a gross lease’s total cost once taxes, insurance, and maintenance are added. Always build a full budget before comparing options.
Accepting vague maintenance definitions invites disputes. The lease should spell out exactly what counts as maintenance versus capital expenditure, who approves major work, and how costs are documented. Ambiguity favors whoever writes the checks, which is not you.
For retail tenants, percentage rent clauses sometimes appear alongside net structures. If your lease includes both pass through expenses and a percentage of sales, model the combined burden carefully. The two mechanisms can stack into an unexpectedly heavy total.
Overlooking insurance requirements costs real money. Landlords can mandate coverage levels and carriers that exceed what you would otherwise buy. Price the required insurance during due diligence, not after signing.
Final Thoughts
The difference between double net and triple net comes down to one question: who pays for maintenance? Everything else about the two structures is essentially the same.
Neither is universally better. Evaluate the total occupancy cost, review the building’s expense history, and negotiate caps and audit rights. The label on the lease matters far less than the specific obligations written inside it.
With clear definitions and realistic budgeting, both structures can work well. The tenants who get hurt are the ones who sign based on base rent alone and discover the real cost later.