Two industrial buildings can advertise the same rent per square foot and still deliver very different income to an owner. The reason usually comes down to the lease structure — specifically, who pays for taxes, insurance, and the cost of operating and maintaining the building. In industrial real estate, the lease is not just a rent number; it is a contract that allocates costs and risks between landlord and tenant. Understanding how those leases are built is one of the most practical ways to read what a warehouse actually earns.
Rent is not the same as income
When investors evaluate a property, the number that matters is net operating income — roughly the income left after operating expenses, before financing. The headline rent is only the starting point. Property taxes, insurance, common-area maintenance, repairs, and management all sit between gross rent and NOI. The lease structure decides whether the tenant or the landlord carries those costs, and that single decision can move the owner's net income meaningfully even when the quoted rent looks identical.
This is why two questions matter more than the rent itself: which expenses does the tenant reimburse, and which expenses does the owner absorb? The answer is encoded in the lease type.
Triple-net (NNN) leases
A triple-net lease is the structure most associated with single-tenant industrial. Under a true NNN lease, the tenant pays base rent plus its share of the three "nets" — property taxes, building insurance, and maintenance (often including common-area maintenance, or CAM). In a single-tenant building, that frequently means the tenant is responsible for essentially all of the property's operating costs.
For an owner, the appeal is predictability. Because the tenant covers taxes, insurance, and maintenance, increases in those costs are largely passed through rather than eroding the owner's return. The income stream tends to be cleaner and easier to underwrite, which is part of why net-leased industrial is often described as relatively passive to own.
The trade-offs are real, though. NNN structures vary in how far the "net" actually extends — some leave certain capital items, like the roof or structure, with the landlord. The credit and durability of the single tenant matter enormously, because the income depends heavily on that one occupant continuing to perform. And a building optimized for one tenant can be costly to re-tenant if that tenant leaves. Reading the actual lease language — not just the "NNN" label — is essential.
Gross (full-service) leases
At the other end sits the gross lease, sometimes called full-service. Here the tenant pays a single, all-in rent, and the landlord pays the operating expenses out of that rent. The tenant's cost is simple and predictable; the landlord absorbs the variability.
Gross leases are less common in pure industrial than in office, but they appear, particularly in smaller multi-tenant buildings or shorter-term arrangements. For an owner, the key risk is expense inflation: if taxes, insurance, or maintenance rise during the lease term, the landlord — not the tenant — feels it, because rent is fixed. That makes careful expense forecasting and sensible rent levels especially important under a gross structure.
Modified gross: the middle ground
Most real-world leases live somewhere between these poles, and the catch-all term is modified gross. In a modified gross lease, landlord and tenant split the operating costs in a negotiated way — the tenant might pay its own utilities and a share of certain expenses while the landlord covers others, or the parties might agree on an "expense stop" where the tenant covers increases above a base-year level.
Because "modified gross" describes a spectrum rather than a fixed formula, the only way to know what a given lease means for income is to read the specific cost-allocation terms. Two modified gross leases can be quite different. This is also where multi-tenant industrial often lands, since shared buildings require a way to apportion common costs across occupants.
Why the structure drives underwriting
The lease type is not a technicality — it changes how a building should be analyzed. A disciplined underwriting and due-diligence process treats the lease as a primary document, asking a consistent set of questions:
- Which expenses are reimbursed, and which are not? This determines how much of the gross rent actually reaches NOI.
- How durable is the income? Single-tenant NNN concentrates risk in one occupant; multi-tenant modified gross spreads it but adds management complexity.
- What happens at expiration or on a vacancy? Re-tenanting costs, downtime, and tenant-improvement obligations differ sharply by structure.
- Who carries inflation risk? Pass-through structures protect the owner from rising costs; gross structures do not.
You can see how this fits a broader process in our guide to CRE underwriting and due diligence, and how leasing fits the value-creation picture in value-add industrial, explained.
Lease structure and asset quality
Lease terms also interact with the physical and locational quality of the building. A functional, well-located warehouse — appropriate clear height, loading, and access — tends to attract stronger tenants and more favorable lease terms, while a marginal building may require concessions that show up as landlord-paid costs. In other words, the lease and the asset are not independent; what makes a strong industrial asset often shows up in the quality of the lease it can command. The same supply-and-demand forces behind the Sunbelt industrial thesis ultimately express themselves through rents and lease terms, too.
A grounded way to read leases
The practical takeaway is simple: never judge an industrial building by its quoted rent alone. Ask how the lease allocates taxes, insurance, and maintenance, how durable the income is, and who absorbs cost increases over time. A higher gross rent under a structure that loads expenses onto the landlord can deliver less net income than a lower rent under a clean net lease. Reading the structure — not just the number — is how disciplined investors understand what a property really earns.
To go deeper, explore our industrial insights, or see how to invest for the way we put these ideas to work. Have a question about a specific situation? Reach out — we're glad to talk it through.
