The building was 80% full. You applied the 5% controllable cap, grossed up janitorial and utilities, billed each pro-rata share, and the statement footed to the penny. But the audit letter still came. The finding was not bad arithmetic. It was bad sequencing: the cap ran before the gross-up, so it never bound at all.

A CAM gross up calculation restates occupancy-driven variable costs to what they would have been at a stated threshold, usually 95% or 100%. The formula is: actual variable expense divided by actual occupancy percent, times the gross-up target percent. You then apply the cap to the grossed-up controllable pool, never before it, because the reverse order tests a smaller pool and lets grossed-up dollars slip past the ceiling.

Accounting guidance, not legal advice. Every threshold, cap structure, and deadline here is a negotiated lease term, not statute. Read your lease, and ask counsel about how to read it.

Why Generic Guidance Breaks at the Ledger

Search this topic and you find two content worlds. Law-firm posts cover gross-ups with one hypothetical building. Cap articles cover cumulative versus compounding structures. Neither camp shows a journal entry, and neither shows both clauses at once. That split is where recoveries leak. Baker Tilly names expense misclassification as the most common gross-up issue, and flags gross-up applied to every category as a red flag.

Step 1: Classify Variable Versus Fixed

Gross up only what truly moves with occupancy. Classification drives every later number.

Landscaping clears this up. The landlord controls it, so it belongs inside the cap, but it does not scale with occupancy, so you must not gross it up. Controllable and variable are two axes, not one.

Apply the Factor, Then Cap in the Right Order

The formula has two halves, and most sources give only one: grossed-up variable equals actual variable divided by actual occupancy percent, times the gross-up target. Take a 95% target in an 80%-full building: the factor is 0.95 divided by 0.80, or 1.1875. Run one sanity check every year, because if actual occupancy already meets the threshold, the gross-up must do nothing. Grossing up a full building is a listed audit finding. If the lease has a base year, gross that year up too, or the tenant inherits a base that stays too low forever.

Then comes the step nobody covers. Gross up, split controllable from non-controllable, and cap the grossed-up controllable portion only. Cap first and you test a smaller pool, so the ceiling rarely binds, and the gross-up dollars added afterward never face the cap at all.

What the Wrong Order Costs

On a 100,000 square foot building at 80% occupancy with a 95% threshold and a 5% cap, grossed-up controllable costs of $440,250 run $9,750 over a $430,500 ceiling, and the landlord eats the excess. Flip the sequence, and un-grossed controllable costs of $384,000 never breach the ceiling, so the cap does nothing. A 12% tenant then absorbs $1,170 of over-recovery, and it repeats every year the lease stays mis-coded.

Frequently Asked Questions

Is the cap applied before or after the gross-up? After, and to the grossed-up controllable pool only. Capping first tests a smaller un-grossed pool that rarely breaches the ceiling, which neutralizes the cap and over-recovers from tenants.

Which expenses should not be grossed up? Property taxes, insurance, security, elevator and HVAC contracts, and landscaping, because none of them scale with occupancy. Grossing up fixed costs is one of the most frequently cited findings in tenant CAM audits.

Related reading: three-way reconciliation and cash vs accrual accounting.