Commercial leases assign responsibility for a property’s operating expenses, property taxes, insurance, maintenance, in fundamentally different ways depending on the lease structure. Understanding these structures matters enormously, whether you’re a landlord projecting net income or a tenant budgeting total occupancy costs, since the same quoted rent can mean very different total costs depending on the lease type.

Why Lease Structure Matters So Much

Unlike most residential leases, where rent is simply rent, commercial leases vary in which party, landlord or tenant, bears responsibility for specific ongoing property expenses. A quoted rental rate is meaningless without understanding the lease structure behind it, since a lower rate under a triple net lease could mean higher total occupancy cost than a higher rate under a full-service gross lease.

Gross Lease

Under a gross lease, the tenant pays a single, all-inclusive rent amount, and the landlord is responsible for covering property taxes, insurance, and maintenance from that rent. This structure offers tenants simplicity and predictability, since their monthly cost doesn’t fluctuate with changes in operating expenses.

Lease Type	Tenant Pays	Landlord Pays
Gross Lease	Base rent only	Taxes, insurance, maintenance
Modified Gross	Base rent + some expenses	Remaining expenses
Net Lease (Single)	Base rent + property taxes	Insurance, maintenance
Double Net Lease	Base rent + taxes + insurance	Maintenance
Triple Net Lease (NNN)	Base rent + taxes + insurance + maintenance	Little to none

Modified Gross Lease

A modified gross lease falls between a gross and net lease, the tenant typically pays base rent plus certain specific expenses (often utilities or a portion of increases in operating costs above a base year), while the landlord continues covering other core expenses. The specific division of responsibilities varies significantly and should be clearly detailed in the lease agreement.

Net Lease

In a net lease, the tenant pays base rent plus property taxes, in addition to the landlord retaining responsibility for insurance and maintenance. This is a less common standalone structure compared to double or triple net leases but represents a step toward shifting more expense responsibility to the tenant.

Double Net Lease

Under a double net lease, the tenant pays base rent plus both property taxes and insurance, while the landlord typically remains responsible for structural maintenance and major repairs.

Triple Net Lease (NNN)

The triple net lease is one of the most common structures in commercial real estate, particularly for single-tenant retail and industrial properties. The tenant pays base rent plus property taxes, insurance, and maintenance costs, essentially all major ongoing property expenses, leaving the landlord with a more predictable, lower-maintenance income stream.

Why Triple Net Leases Appeal to Landlords

Triple net leases shift most operating expense risk and responsibility to the tenant, making the landlord’s income more predictable and reducing the ongoing management burden significantly. This structure is particularly common for properties leased to established, creditworthy tenants, like national retail chains, where the tenant’s financial strength provides confidence they can reliably cover these additional obligations.

What Tenants Should Understand About Triple Net Leases

Tenants considering a triple net lease should carefully evaluate the full expected cost, not just the base rent, since property tax increases, insurance premium changes, and maintenance needs can meaningfully affect total occupancy cost over the lease term. Requesting historical expense data and understanding any caps on expense increases (if negotiated) helps tenants budget more accurately.

Percentage Leases

Common in retail settings, particularly shopping centers and malls, a percentage lease has the tenant pay a base rent plus a percentage of their gross sales above a specified threshold. This structure aligns landlord income with tenant business performance but requires careful sales reporting and verification provisions in the lease.

Ground Leases

A ground lease involves a tenant leasing the land itself, typically for a long term, and constructing their own building on it, which may revert to the landowner at the end of the lease term depending on the specific agreement. This structure is common for certain retail, hotel, and mixed-use developments.

Negotiating Lease Structure as Part of the Deal

Lease structure is a negotiable element of a commercial lease, not simply a fixed given. Landlords and tenants can negotiate which structure applies, along with specific caps, exclusions, or modifications within that structure, as part of the overall lease negotiation.

Comparing Total Occupancy Cost Across Structures

When comparing lease options across different properties, calculate the full expected occupancy cost, base rent plus estimated pass-through expenses, under each lease structure, rather than comparing base rent figures alone, since this can be misleading given how differently expenses are allocated across lease types.

Frequently Asked Questions

Which lease type is most common for retail properties?

Triple net leases are particularly common for single-tenant retail properties and national chain locations, while shopping centers and malls often use percentage leases in combination with a base rent structure.

Are triple net leases better for landlords than tenants?

They shift more expense responsibility and risk to the tenant, generally favoring landlord income predictability, though tenants may negotiate a lower base rent in exchange for accepting this additional expense responsibility.

Can lease structure change during the lease term?

Generally no, the structure is established in the lease agreement at signing and typically remains fixed for the lease term, though specific expense caps or adjustment mechanisms may be built into the original agreement.

How do I compare a gross lease offer to a triple net lease offer?

Calculate the total expected annual occupancy cost under each option, including estimated pass-through expenses for the triple net option, rather than comparing the base rent figures alone, which can be misleading.

Final Thoughts

Commercial lease structures, gross, modified gross, net, double net, and triple net, determine who bears responsibility for a property’s ongoing operating expenses, fundamentally shaping both landlord income predictability and tenant total occupancy cost. Understanding which structure applies to any lease you’re evaluating, and calculating the full expected cost accordingly, is essential before comparing options or entering into a commercial lease agreement.