The main types of commercial leases are the full service gross lease, the modified gross lease, the three tiers of net lease (single, double, and triple net), and the percentage lease, with ground leases, build-to-suit leases, and industrial leases serving more specialized situations. What separates them is who pays for the building’s operating costs on top of base rent — property taxes, insurance, maintenance, and sometimes capital repairs. The lease type you sign determines whether you write one predictable check each month or budget separately for a dozen moving expense categories over the life of the deal.
How Lease Types Are Organized
The most useful way to understand commercial lease categories is as a spectrum of expense allocation. On one end, the landlord absorbs every operating cost and the tenant pays a single flat rent. On the other end, the tenant pays base rent plus a pro-rata share of taxes, insurance, maintenance, and sometimes major capital replacements. Three expense categories drive the sorting: property taxes, building insurance, and common area maintenance, usually shortened to CAM.
Where a lease sits on that spectrum shapes how predictable your occupancy cost will be, how much you’ll pay in a bad year for the building, and how much due diligence you need to do before signing. The names below are industry-standard shorthand, but the actual terms live in the lease document itself. Two leases both labeled “modified gross” can allocate costs very differently.
Full Service Gross Lease
A full service gross lease is the simplest structure for the tenant. You pay one flat rental rate each month, and the landlord covers property taxes, insurance, building maintenance, and usually utilities out of that amount. No separate invoice arrives when the parking lot gets repaved or the building’s insurance premium goes up. Office tenants in multi-tenant buildings encounter this structure most often.
The simplicity comes with a catch. Landlords protect themselves against rising costs through either a base year provision or an expense stop. Under a base year provision, the landlord pays operating expenses at whatever level they actually reach during a designated calendar year, typically the first year of your lease. In every year after that, you pay your proportionate share of any increase above that base year amount. If operating expenses in the base year total $8.50 per square foot and climb to $9.75 the following year, you cover the $1.25 difference on your share of the building.
An expense stop works differently. Instead of tying your threshold to a real year of costs, the landlord sets a fixed dollar amount per rentable square foot, say $9.00, at lease signing. Anything above that number is yours. The key distinction: a base year amount floats based on what actually happened during that year, meaning you can’t verify it without reviewing the landlord’s expense records. An expense stop is a hard number written into the lease.
Rent escalation clauses also appear in gross leases. A fixed escalation increases your rent by a set percentage or dollar amount at specified intervals, which is easy to forecast. A CPI-based escalation ties increases to the Consumer Price Index. Watch for “greater of” language that makes the escalation the higher of CPI or a minimum percentage like 3%. That structure gives the landlord inflation protection with a guaranteed floor while you absorb all the upside risk. Over a ten-year lease, the cumulative difference between a fixed escalation and a CPI-based one can reach tens of thousands of dollars.
Modified Gross Lease
A modified gross lease splits operating expenses between landlord and tenant, but no standard formula exists for the split. In one building, the landlord might cover taxes and insurance while the tenant handles utilities and in-suite maintenance. Down the street, the arrangement could look completely different. The term “modified gross” signals a hybrid and tells you almost nothing until you read the specific lease language.
This flexibility is both the appeal and the danger. You get a fixed base rent like a gross lease, plus direct control over certain costs like your own utility consumption. But because no industry-standard cost distribution exists for modified gross leases, the negotiation matters enormously. Every expense responsibility should be spelled out explicitly. If the lease doesn’t clearly assign a cost category to one party, assume it will become a dispute later.
Net Leases: Single, Double, and Triple Net
Net leases flip the expense model. You pay a lower base rent, but the building’s operating costs get passed through to you as separate charges. Your share is calculated on a pro-rata basis — your rented square footage divided by the building’s total rentable area. Net leases come in three tiers, each adding another expense category to the tenant’s tab.
Single Net Lease (N)
A single net lease adds property taxes to your base rent. The landlord still covers insurance and building maintenance. This is the least common of the three net structures and provides only a thin layer of expense separation.
Double Net Lease (NN)
A double net lease adds insurance premiums on top of the property taxes you’re already paying. You’re responsible for base rent, taxes, and building insurance. The landlord retains responsibility for structural maintenance and common area upkeep.
Triple Net Lease (NNN)
A triple net lease is the most aggressive pass-through structure and the most common for freestanding retail buildings and single-tenant commercial properties. You pay base rent plus your pro-rata share of all three expense categories: taxes, insurance, and CAM. CAM charges cover everything from parking lot repairs and landscaping to management and administrative fees.
The real financial exposure in a NNN lease goes beyond routine operating expenses. Under a true triple net structure, the tenant may also be responsible for capital expenditures, meaning non-routine replacements like a new roof or a full HVAC system. A roof replacement on a commercial building can easily exceed six figures. Not every NNN lease pushes capital costs to the tenant, but many do, and the distinction between a “standard” NNN and an “absolute” NNN often turns on exactly this point. Read the capital expenditure provisions carefully and understand whether your obligations are capped.
Why Audit Rights Matter in Any Net Lease
If you’re paying pass-through expenses, mistakes in the landlord’s calculations cost you real money. Overcharges happen, whether from errors in pro-rata share math, expenses that shouldn’t be passed through under your lease, or administrative fees that exceed agreed limits. A well-drafted lease gives you the right to review the landlord’s books and records supporting the annual expense reconciliation statement. Most leases require written notice of a dispute within 30 to 90 days of receiving the reconciliation. If your lease doesn’t include audit rights, negotiate them in. Without the ability to verify what you’re being charged, you’re trusting the landlord’s accounting on faith.
Percentage Lease
In high-traffic retail environments — shopping centers, malls, and mixed-use developments — landlords sometimes tie a portion of the rent to the tenant’s sales performance. This creates a percentage lease, where the landlord participates in the upside when the tenant does well.
A percentage lease has two components. The base rent is a fixed monthly amount, typically set below what a standard lease for the same space would charge. The percentage rent kicks in only after your gross sales exceed a specified annual threshold called the breakpoint.
The natural breakpoint is calculated by dividing the annual base rent by the agreed-upon percentage rate. If your base rent is $60,000 per year and the percentage rate is 6%, the natural breakpoint is $1,000,000. You pay no percentage rent until your annual sales clear that mark. Every dollar above the breakpoint generates an additional 6 cents in rent. An artificial breakpoint is a number the parties negotiate independently of that formula, sometimes lower (which triggers percentage rent sooner) and sometimes higher (which gives the tenant more breathing room).
The lease must define “gross sales” precisely, because the definition determines what gets counted. Exclusions typically include sales tax collected, customer returns, employee discounts, and transfers between the tenant’s other locations. Tenants submit periodic sales reports to the landlord for verification, and the landlord usually has the right to audit those reports.
Percentage leases frequently include a continuous operation clause requiring the tenant to keep the business open and operating throughout the lease term. Some clauses specify days per week or hours per day. A tenant who closes up shop but keeps paying base rent generates zero percentage rent for the landlord and drags down foot traffic for every other tenant in the center. Even if you’re willing to pay the base rent on a shuttered store, a continuous operation clause may prevent you from “going dark.” That constraint matters if your business hits a rough patch, because you can’t simply scale down operations without risking a lease default.
Ground Lease
A ground lease separates ownership of the land from ownership of whatever gets built on it. The landlord leases vacant land to a tenant for a long term, commonly 99 years, though shorter terms of 49 or 50 years exist depending on the market and local tax considerations. The tenant finances and constructs a building on the land, then operates it for the duration of the lease.
The tenant owns the improvements during the lease term and can typically claim depreciation on them for tax purposes using IRS Form 4562.1Internal Revenue Service. About Form 4562, Depreciation and Amortization What happens at expiration depends on the lease terms. Many ground leases include a reversionary interest, meaning the building and all improvements transfer to the landowner when the lease ends. Others allow the tenant to remove improvements or negotiate purchase terms. Because the tenant is investing heavily in a building on someone else’s land, the lease length and reversion terms are the most heavily negotiated provisions in the agreement.
Build-to-Suit Lease
A build-to-suit lease reverses the construction risk. Instead of the tenant building on leased land, the landlord constructs a customized facility to the tenant’s exact specifications. The tenant commits to a long-term lease, typically 10 to 20 years, before construction begins. That commitment is what allows the landlord to secure construction financing.
The rental rate reflects the total development cost: land acquisition, construction, financing, and the landlord’s return on investment, all amortized over the lease term. The tenant avoids massive upfront capital expenditure and moves into a purpose-built facility, but pays for that convenience through higher rent over the life of the lease. This structure is common for corporate headquarters, medical facilities, and distribution centers where the tenant’s operational requirements are too specialized for existing buildings.
Industrial and Warehouse Lease
Industrial leases are defined more by physical specifications than by financial structure. The expense allocation is almost always triple net, but the negotiation centers on the building’s operational capabilities. Clear height — the vertical distance from the finished floor to the lowest overhead obstruction — determines what equipment and racking systems you can install. Modern distribution facilities typically offer 32 to 40 feet of clear height.
Loading dock configurations matter enormously for logistics tenants. The lease specifies the number and type of docks, distinguishing between dock-high doors (which accommodate standard trailer heights) and grade-level doors (for drive-in access). Power capacity, floor load ratings, and specialized ventilation requirements all need to be explicitly documented. CAM costs in industrial properties tend to run lower than in office or retail settings because the common areas are minimal. There’s no lobby to maintain or elevator to service.
Which Lease Type Fits Which Tenant
Each structure solves a different problem. The ranking below moves from most predictable monthly cost to least.
- A full service gross lease fits tenants who want budget predictability and don’t want to manage a building. Office tenants in multi-tenant buildings are the typical users. Watch the base year calculation and escalation method, because that’s where the hidden cost lives.
- A modified gross lease fits tenants willing to control some costs directly in exchange for a lower base rent. The split is entirely negotiated, so the lease document matters more than the label.
- Single and double net leases are relatively uncommon stops on the way to triple net. They tend to appear in markets or buildings where the landlord has reason to retain certain cost categories.
- A triple net lease fits tenants of freestanding or single-tenant buildings who want the lowest possible base rent and are prepared to manage building expenses, including, in some cases, capital replacements. Investor-landlords prefer this structure because it insulates them from operating cost volatility.
- A percentage lease fits retail tenants in high-traffic centers where the landlord’s leasing economics depend on the tenant mix generating sales. Expect a continuous operation clause and precise definitions of gross sales.
- A ground lease fits tenants and developers who want to build on land they can’t buy, usually because the owner won’t sell. The long term and reversion terms are what you’re really negotiating.
- A build-to-suit lease fits tenants with highly specialized facility requirements and the credit profile to anchor a 10-to-20-year commitment.
- An industrial lease fits warehouse, distribution, and light manufacturing tenants, almost always on a triple net basis, with physical specifications doing the heavy lifting in the negotiation.
Provisions That Change the Economics Regardless of Type
A few lease terms cut across every category and can shift the real cost of occupancy more than the label on the lease. These deserve attention whether you’re signing a gross lease, a NNN, or anything in between.
Personal Guarantees
Most commercial tenants sign through a business entity, an LLC or corporation, precisely to limit personal liability. Landlords know this and routinely require a personal guarantee from one or more of the business’s principals. A full guarantee makes the guarantor personally liable for every obligation under the lease: rent, operating expenses, maintenance, insurance, and damages. A limited guarantee caps the guarantor’s liability at a fixed dollar amount or restricts it to monetary obligations only. A “good guy” guarantee, common in certain markets, releases the guarantor’s liability once the tenant surrenders the premises and pays all rent through the surrender date. Negotiate the guarantee as aggressively as you negotiate the rent. A personal guarantee can expose your house, savings, and personal assets to a landlord’s claim if the business fails.
Rent Acceleration on Default
If you don’t cure a default within the specified window, the landlord’s remedies escalate quickly. The lease may allow the landlord to terminate the agreement, repossess the premises, and accelerate the rent. Rent acceleration makes the entire remaining balance of rent due immediately, as a lump sum. If you have seven years left on a lease at $15,000 per month, acceleration means you owe $1.26 million on the spot. Some jurisdictions limit acceleration or require the landlord to mitigate damages by attempting to re-lease the space, but the clause itself is standard in most commercial leases.
SNDA Protection From Foreclosure
Most commercial properties carry a mortgage. If the landlord defaults on that mortgage and the lender forecloses, your lease could be at risk. A Subordination, Non-Disturbance, and Attornment agreement (SNDA) addresses this directly. The subordination piece acknowledges the lender’s mortgage takes priority over your lease. The non-disturbance piece is what you care about: the lender agrees that if it forecloses, it will honor your lease and let you remain in the space for the remainder of your term. The attornment piece commits you to recognizing the new owner as your landlord. Request an SNDA before you sign.
Estoppel Certificates
If the landlord sells the building or refinances the mortgage, you’ll be asked to sign an estoppel certificate confirming facts like the current rent amount, whether your security deposit is intact, whether any rent payments are outstanding, and whether you have any pending claims against the landlord.2house.gov. Estoppel Certificate Once you sign, you’re generally bound by what the certificate says. Review it carefully, and make sure any side agreements, amendments, or lease attachments are referenced rather than inadvertently excluded.
Usable vs. Rentable Square Footage
Before you can evaluate any lease’s rent on a per-square-foot basis, confirm which square footage number the landlord is using. Usable square footage is the space you actually occupy, measured wall to wall within your suite. Rentable square footage is larger because it includes your proportionate share of the building’s common areas: lobbies, hallways, elevator corridors, restrooms, and mechanical rooms. The multiplier that converts usable into rentable is the load factor. A load factor of 1.15 means you’re paying rent on 15% more space than you physically occupy. For a 2,000-square-foot usable suite at $30 per square foot, a 1.15 load factor adds $9,000 to annual rent. Load factors typically range from 10% to 20% in office buildings. Ask for both numbers and verify how the rentable figure was calculated.
Get the Key Terms Into the Letter of Intent
Most commercial lease transactions begin with a letter of intent that outlines base rent, lease term, expense structure, tenant improvement allowance, permitted use, renewal options, and rent escalation method in a short document both parties sign. The LOI is usually non-binding, but it sets the framework for the lease negotiation that follows. Terms that aren’t addressed in the LOI tend to default to landlord-favorable positions in the formal lease draft. If a provision is important to you — a cap on CAM charges, an exclusivity clause, a specific guarantee structure — get it into the LOI. Negotiating leverage erodes significantly once the LOI is signed and the tenant has psychologically committed to the space.