Operating Expense ‘Gross-Up’ Clauses: When They’re Fair (and When They’re Not)

A gross-up clause lets the landlord calculate certain operating expenses as if the building were more fully occupied (e.g., 95%), so tenants pay a "normalized" share rather than an artificially low one. It's fair when limited to variable, occupancy-driven costs like janitorial and common-area utilities — and unfair when it sweeps in fixed costs, capital items, or "all operating expenses."

If your lease includes CAM or operating expense pass-throughs (NNN or modified gross — in a triple net lease the tenant pays "insurance, maintenance, and taxes" on top of rent, per LII Wex: triple net lease), you may see a clause that allows the landlord to “gross up” expenses.

Gross-up can be legitimate. It can also be written so broadly that it inflates your share of costs in a partially vacant building.

This guide explains how gross-up works, what expenses should (and shouldn’t) be grossed up, and tenant-friendly guardrails to negotiate. (Not legal advice.)

What does “gross-up” mean?

When a building is not fully occupied, some variable operating costs are lower than they would be at normal occupancy.

A gross-up clause lets the landlord calculate certain expenses as if the building were more occupied—so tenants pay a more “normalized” amount.

Example (simplified):

The building is 60% occupied.
Janitorial costs are low because fewer suites are used.
The landlord “grosses up” janitorial as if the building were 95% occupied.
Tenants then pay their proportionate — pro rata, "in proportion" to their fractional share (LII Wex: pro rata) — share of the grossed-up number.

Gross-up is most common in modified gross and office leases (see the modified gross base-year guide), but it can also appear in NNN structures.

When gross-up is reasonable

Gross-up is generally more defensible for variable expenses that move with occupancy, such as:

janitorial
common-area utilities
trash service
some maintenance and supplies

The concept: tenants shouldn’t get an artificial discount just because the building is temporarily vacant—because if occupancy rises, those costs will rise too.

The problem: gross-up is often drafted too broadly

Tenant issues happen when gross-up applies to:

1) Fixed costs that don’t change with occupancy

Examples:

property management fee (often fixed or percentage-based)
security systems with fixed contracts
roof/structural costs (which also should not be CAM in many cases; see the roof and HVAC replacement guide)

If a cost is truly fixed, grossing it up makes no sense.

2) Capital items

Capital expenditures — "funds used to acquire, upgrade, or maintain capital assets" (LII Wex: capital expenditure) — are a different animal from occupancy-driven operating costs. If capital replacements are being passed through at all, they should usually be amortized—gross-up shouldn’t magnify them.

3) “All operating expenses”

If the lease says the landlord may gross up “all operating expenses,” it’s a red flag. It can produce a number that’s higher than real-world costs.

Tenant-friendly gross-up guardrails to negotiate

If the landlord insists on gross-up, ask for boundaries like:

Limit gross-up to variable expenses only (define a list).
Set an occupancy cap (e.g., gross-up to no more than 95%).
Require a minimum actual occupancy before gross-up applies (e.g., only if occupancy is below 85%).
Exclude fixed costs, capital items, and management markups from gross-up.
Require disclosure of the occupancy assumptions and the math in annual reconciliations.

Also pair this with audit rights and reconciliation deadlines.

A quick tenant checklist for gross-up language

Does it define what expenses can be grossed up?
Does it state the occupancy percentage used (e.g., 95%)?
Does it exclude fixed costs and capital items?
Does it require the landlord to disclose calculations?
Can you audit the numbers?

How BizLeaseCheck helps

BizLeaseCheck flags gross-up provisions and highlights:

overly broad “gross-up all expenses” language
missing occupancy caps
operating expense definitions that include non-operating items

Upload a lease for a fast first-pass review.

Frequently asked questions

What does it mean when a landlord “grosses up” operating expenses?

It means the landlord recalculates certain expenses as if the building were more occupied than it actually is. If a building is 60% occupied, variable costs like janitorial run low; a gross-up clause lets the landlord bill those costs as if occupancy were, say, 95%, and each tenant pays its proportionate share of that normalized number.

Is a gross-up clause always bad for tenants?

No. Gross-up is defensible for genuinely variable expenses that move with occupancy — janitorial, common-area utilities, trash service, some maintenance and supplies. The logic: tenants shouldn’t get an artificial discount just because the building is temporarily vacant, since those costs rise as occupancy recovers. The problems start when the clause reaches fixed costs, capital items, or “all operating expenses.”

Which expenses should never be grossed up?

Costs that don’t change with occupancy: fixed-contract items like security systems, property management fees that are flat or percentage-based, and roof or structural work. Capital replacements shouldn’t be grossed up either — if they’re passed through at all, they should be amortized, not magnified by an occupancy adjustment.

What guardrails should I negotiate into a gross-up clause?

Five practical ones: limit gross-up to a defined list of variable expenses; cap the assumed occupancy (e.g., no more than 95%); require a minimum actual-occupancy trigger (e.g., applies only below 85%); exclude fixed costs, capital items, and management markups; and require the landlord to disclose the occupancy assumptions and math in every annual reconciliation.

Not legal advice

This article is for informational purposes only and is not legal advice. Gross-up practices vary by lease language, building type, and market. Use this guide as a checklist and confirm specifics with qualified professionals.