Net lease versus gross lease: where the hidden costs hide in US offices

What to take away

A lease labeled net or gross tells you which column an expense lands in. It says nothing about which expenses exist, how they are measured, or who may audit them. Two suites in one building can carry different effective costs under the same structure once the definitions diverge.

The structures that get compared

A net lease passes part or all of the operating cost to the tenant. The forms run from single net through double net to triple net, and the net lease definition covers how each one splits taxes, insurance and maintenance. Triple net is the most common version in US offices.

Triple net turns up in single-tenant and build-to-suit office buildings. Net Lease Office Properties, the office REIT spun off by W. P. Carey in November 2023, holds a portfolio leased on that model. BXP, whose holdings include Salesforce Tower in San Francisco, reports recoveries from tenants as its own revenue line.

A gross lease works the other way. The landlord collects one rent figure and pays operating expenses from it, which is how Cornell's entry on the gross lease frames the split.

Coworking is the retail version of that trade. WeWork and similar operators charge one monthly membership that bundles space, utilities and internet, and the operator carries the building's volatility.

A modified gross lease sits between them. Base rent covers some expenses, and the tenant reimburses a named list: janitorial, utilities above a threshold, or a share of taxes. No two modified gross leases read alike. They cluster in older multi-tenant buildings, where janitorial and taxes can be named but utilities cannot be isolated.

The arithmetic that turns a quoted rent into an actual monthly figure is set out in Quoted rent vs actual rent, worth reading before you compare structures.

The criteria that matter

One rent number cannot settle this comparison. Measurement comes first. BOMA International publishes the Standard Method for Measuring Floor Area, ANSI/BOMA Z65.1-2017, and the older 1996 version still sits in some leases.

In New York City, the Real Estate Board of New York publishes a standard office lease form that landlords often start from, so area and expense language can differ from building to building.

Load factors of 15 to 25 percent are typical, and the load factor sets the square feet you reimburse on.

The headline rent row explains why comparisons go wrong. A lower headline rent on a net lease is not a discount: it is a smaller bundle with more risk attached.

Ask which column leaves you paying for spending you cannot see, then price it. The commercial leasing requirements set the floor for what any structure must include.

Base year versus expense stop

A base year sets a reference point. The tenant pays its share of building expenses above what the landlord spent in the base year, usually the first year of the term. A low base year hurts the tenant, because the comparison starts low and the excess grows.

An expense stop is a ceiling on the landlord's contribution. The tenant pays everything above a set figure, often quoted per square foot. The stop does not move with the market; a base year does.

Both devices sit beside escalators. Cornell's escalator clause entry separates fixed percentage increases from index linked ones such as CPI, and the two behave differently in a year when expenses jump.

US office operating expenses typically run $8 to $15 per square foot a year in most markets, and $20 or more in Manhattan, where property taxes carry much of the total. BOMA International's Experience Exchange Report publishes those benchmarks by market and building class.

Example: a five year office renewal

An office tenant with five years behind it gets a renewal offer on a base year, but the landlord will not forecast expenses. Assume building expenses rise 4 percent a year, labeled illustrative rather than a forecast.

At $12 per square foot in year one, that reaches roughly $14.60 by year five. The reimbursement line outgrows the rent in every later year.

An expense stop set at today's figure bends the same line flatter early and steeper later. Comps from CompStak or CoStar Group show what nearby tenants pay for the same space. The Commercial leasing examples page shows two tenants reading one offer differently.

Where each structure is the right answer

A triple net lease is right for a tenant that wants the lowest headline rent and can absorb variable costs, and for a landlord that wants predictable net income.

A gross lease is right for a tenant on a fixed budget: small suites, short terms or shared buildings where metering utilities is impractical. The landlord carries the volatility and prices it in. A coworking membership is the purest version of that trade.

A modified gross lease is right in a multi tenant office where janitorial, utilities and taxes can be named but not isolated. Older multi-tenant buildings are its usual home, and the named list is where the negotiation happens.

Before signing any of them, run three checks:

Working through the commercial lease checklist in document order keeps those three from slipping past review.

The statements come out of property accounting systems such as Yardi Voyager or MRI Software. Lease accounting platforms like LeaseQuery and Visual Lease track the resulting obligations under ASC 842.

What none of the structures solve

Every structure here shares one weakness. None gives the tenant control over the spending it reimburses. A base year, an expense stop and a full pass-through all depend on landlord reporting. Audit rights and a precise exclusion list do the real work.

Common questions