What Is an NNN Lease? Comparing Lease Structures

Commercial lease structures fall along a spectrum, from a full gross lease where the landlord covers nearly all operating expenses, to a triple net, or NNN, lease where the tenant covers nearly all of them. Understanding where a specific lease falls on this spectrum is essential for accurately projecting net income on any commercial property in the Washington DC metro area, since two properties with identical gross rent can produce very different net returns depending on the lease structure.

The Full Gross Lease

In a full gross lease, the tenant pays a single, all-inclusive rent figure, and the landlord is responsible for property taxes, insurance, maintenance, and often utilities. This structure is common in older office buildings and some smaller retail spaces, and it places the most operating expense risk on the landlord, since rising costs are not automatically passed through to the tenant.

The Modified Gross Lease

A modified gross lease sits between a full gross lease and a triple net lease, with the landlord and tenant splitting responsibility for specific expense categories according to the negotiated lease terms. A common variation has the tenant paying their own utilities and janitorial costs directly, while the landlord retains responsibility for property taxes, insurance, and structural maintenance.

Single Net and Double Net Leases

Between a modified gross lease and a full triple net lease sit single net leases, in which the tenant pays property taxes in addition to rent, and double net leases, in which the tenant pays property taxes and insurance but the landlord retains responsibility for maintenance. These intermediate structures are less common than full gross or full triple net leases but appear regularly in certain retail and industrial deals.

The Triple Net Lease

A triple net lease shifts property taxes, insurance, and maintenance to the tenant, leaving the landlord with base rent as close to pure net income as a lease structure allows, aside from major structural obligations that may remain with the landlord depending on the specific lease language. This structure is the most common choice for single-tenant retail, medical, and industrial properties leased to a single, typically creditworthy tenant.

• Full gross lease: landlord covers taxes, insurance, and maintenance
• Modified gross lease: landlord and tenant split expense categories per negotiated terms
• Single net lease: tenant covers property taxes only
• Double net lease: tenant covers property taxes and insurance
• Triple net lease: tenant covers property taxes, insurance, and maintenance

Why Lease Structure Matters for Valuation

A property advertised at a certain gross rent figure can look identical to another property on the surface, but if one operates under a gross lease and the other under a triple net lease, the actual net operating income, and therefore the property valuation at a given cap rate, will differ substantially. Investors comparing DC metro properties across submarkets should always confirm the lease structure before comparing headline rent or price figures.

How Lease Structure Interacts With 1031 Exchange Planning

An investor selling a gross-lease office property and identifying a triple net replacement property should model the difference in ongoing management responsibility and expense exposure carefully, since the two properties may require very different levels of landlord involvement even if their purchase prices and headline cap rates appear similar. This comparison is a common part of 1031 exchange planning for investors seeking to reduce management burden as part of the transition.

Negotiating Lease Structure in a New Lease

For an owner leasing space to a new tenant, whether in the District, Maryland, or Virginia, the choice of lease structure affects both the negotiated base rent figure and the ongoing responsibility for expense fluctuations. A landlord accepting a lower base rent in exchange for a triple net structure may still come out ahead if expense growth over the lease term would otherwise have eroded a gross lease's net income.

Reading the Actual Lease Document

Regardless of how a lease is labeled in a listing or offering memorandum, investors should review the actual lease agreement to confirm exactly which expenses the tenant is responsible for, how expense reconciliations are handled, and whether there are any caps or exclusions on tenant-reimbursable costs. Two leases both marketed as triple net can differ meaningfully in the details, and these details directly affect the true net income an investor should expect to receive.

Frequently Asked Questions

Is a triple net lease always better for a landlord than a gross lease?

Not necessarily. A triple net lease reduces expense risk and management burden for the landlord, but it is typically negotiated alongside a lower base rent than a comparable gross lease would command, since the tenant is assuming additional financial responsibility.

How can an investor tell which lease structure applies to a listed property?

The listing or offering memorandum should specify the lease structure directly, but investors should always review the actual lease document, since terminology can vary between brokers and markets, and the specific allocation of expenses matters more than the label applied to the lease.

Do residential leases use the same NNN terminology as commercial leases?

Generally no. Residential leases in the DC metro area typically follow a gross or near-gross structure, with the landlord covering property taxes and most maintenance, since residential tenants are rarely asked to assume triple net responsibilities in the way commercial tenants are.

This article provides educational content only. It does not constitute tax, legal, or investment advice. Section 1031 defers federal income tax on qualifying real property and does not remove Washington DC transfer or recordation tax obligations. Consult a qualified tax advisor or attorney before acting on any exchange timeline.