What Is a Gross-Up Provision in a Commercial Lease?

A gross-up provision in a commercial lease lets the landlord adjust the building's variable operating expenses up to what they would have been at a stated occupancy level, usually 95 or 100 percent, when the building is not fully leased. It exists so that a tenant's pro-rata share of variable costs stays consistent whether the building is full or half empty. Applied correctly it is fair to both sides; applied wrong, it is one of the most disputed lines on a CAM reconciliation.

Gross-up trips up landlords, tenants, and the people abstracting the lease because it runs backwards from how most expense clauses read. Instead of billing what was actually spent, the landlord bills what would have been spent at full occupancy. This guide explains the mechanics, walks through a worked example, spells out which costs qualify and which do not, and shows why the whole thing depends on reading the lease correctly in the first place.

What is a gross-up provision in a commercial lease?

A gross-up provision is a clause that allows the landlord, in a building that is less than fully occupied, to calculate certain operating expenses as if the building were at a specified occupancy, typically 95 or 100 percent, and to recover from tenants based on that grossed-up figure rather than the lower actual cost. The clause names the occupancy target and, in a well-drafted lease, limits the adjustment to expenses that genuinely vary with occupancy. Without a gross-up clause, a landlord in a half-vacant building recovers only actual variable costs, which can leave a shortfall that the vacancy, not the tenant, created.

How does gross-up work?

Gross-up works by normalizing occupancy-driven costs so a tenant's share does not swing with the building's vacancy. The landlord takes a variable expense, janitorial, utilities, and similar occupancy-linked costs, and scales it up from the actual occupancy to the target occupancy stated in the lease. The tenant then pays its pro-rata share of the grossed-up number. The logic is that a tenant occupying its own space should pay roughly the same amount to service that space whether the rest of the building is leased or dark. Fixed costs that do not move with occupancy, such as property taxes and insurance, are not grossed up, because there is no higher full-occupancy figure to scale them to.

A worked gross-up example

Say a building is 75 percent leased and the landlord's actual janitorial and utility costs for the year come to $75,000, because the vendor is only cleaning and the tenants are only using three-quarters of the building. The lease sets a 100 percent gross-up target. The landlord grosses the $75,000 up to what it would have been at full occupancy: $75,000 divided by 0.75 equals $100,000. A tenant that occupies 25 percent of the building pays 25 percent of the grossed-up pool, which is $25,000, rather than 25 percent of the actual $75,000, which would be $18,750. The extra $6,250 is the point of the clause: the landlord is not stuck absorbing the service cost of the space that tenant occupies just because other suites are empty. Note the direction, gross-up divides by the occupancy rate to scale a partial-occupancy cost up, it does not multiply.

Which expenses can be grossed up?

Only expenses that actually vary with building occupancy can be grossed up. Janitorial and cleaning, utilities like electricity and water for occupied space, trash removal, and some management costs move with how many tenants are in the building, so they qualify. Costs that do not change with occupancy cannot be grossed up because there is no higher full-occupancy amount to scale to: property taxes, building insurance, and most structural and capital items stay flat whether the building is full or empty. A common overcharge is grossing up a fixed cost as if it were variable, which inflates the pool and, if a tenant audits, gets clawed back. A well-drafted lease lists which categories are subject to gross-up so there is no argument later.

What is the occupancy target in a gross-up clause?

The occupancy target is the assumed occupancy the landlord grosses expenses up to, and it is almost always 95 or 100 percent. It matters because it sets the ceiling on how far a variable cost can be scaled. A 100 percent target grosses costs up to full-occupancy levels; a 95 percent target stops a little short, which slightly favors the tenant and reflects that a building rarely runs at literally 100 percent. The most common gross-up error is applying the provision when actual occupancy already meets or exceeds the target, which would inflate expenses beyond what full occupancy costs, something that cannot happen in reality. When actual occupancy is at or above the target, no gross-up should apply at all.

Is a gross-up provision fair to tenants?

A properly drafted and correctly applied gross-up provision is fair, and it can even protect tenants. Without gross-up, a tenant that signs during a low-occupancy period could see its expense share jump as the building fills and fixed-per-suite costs get spread differently, creating volatility year to year. Gross-up smooths that by billing as if the building were always near full. The fairness depends on two things the tenant should confirm in the lease: that gross-up applies only to genuinely variable expenses, not fixed costs like taxes and insurance, and that the occupancy target is clearly stated. If either is loose, the clause can be used to over-recover, which is exactly what a tenant audit looks for.

What happens when gross-up is calculated wrong?

A wrong gross-up calculation is one of the top drivers of disputed CAM charges. The errors cluster into a few types: applying gross-up when the lease does not permit it, grossing up fixed costs that should never be adjusted, using the wrong occupancy figure, or grossing up past the target so expenses are inflated beyond full-occupancy levels. Each one overstates the pool, and every tenant's share flows off that pool, so a single bad gross-up can touch every reconciliation in the building. Because the math itself usually checks out, the mistake hides until a tenant audits the statement against the lease. Getting the gross-up terms out of the lease correctly is the only reliable way to prevent it, which is why so many CAM disputes trace back to abstraction, not accounting.

How to get the gross-up terms right every time

The gross-up provision is only one of several recovery terms a reconciliation depends on, alongside the expense cap, the base year, the pro-rata share, and the exclusions list. All of them live in the lease, and all of them get keyed wrong the same way: someone reads a long lease under deadline and misses a detail buried in an amendment. AI lease abstraction reads the full lease and its amendments and pulls each recovery term, including whether gross-up is permitted, its occupancy target, and which costs it covers, with every value linked to the page it came from. That turns the reconciliation into a check against the real terms instead of a spreadsheet keyed months ago. For the full picture of how bad recovery data creates disputes and how to fix CAM reconciliation errors at the source, and for the year-end mechanics themselves, see our step-by-step guide on how to do a CAM reconciliation. The recovery clauses are also part of the broader lease clause extraction that abstraction handles on every lease.

Once the reconciliation is right, the operating costs behind it still have to be paid and booked. Teams that process the CAM and opex vendor invoices feeding the recoverable pool often route them through accounts payable automation so the numbers that land in the pool match what was actually invoiced. On the accounting side, landlords reconciling collected CAM against their books frequently move the data into QuickBooks with a bank statement to QuickBooks converter. And when a lender is underwriting the property, the grossed-up NOI flows straight into the credit decision, which is where AI loan underwriting picks up the same numbers. Each of those is a different next task; the reconciliation itself starts and ends with reading the lease correctly.

The fastest way to see gross-up done right on your own document is to abstract a lease and check the recovery terms against your last reconciliation. Upload one in the tool at the top of our lease abstraction software page and read the CAM terms it pulls, free.