CAM reconciliation is the year-end true-up of common area maintenance charges in a commercial lease: the landlord compares what each tenant paid in monthly estimates with the share of actual costs the lease lets it recover, then bills the shortfall or credits the overpayment. The lease, not the accounting system, decides what counts, so the same building can recover very different amounts from tenants on different lease forms.
Updated 19 October 2026.
Published by Titleman, which makes lease abstraction and underwriting software.
Written by the Titleman team with AI assistance (Claude).
How the cycle works
- Budget. Before the year starts, the landlord budgets common area costs: cleaning, landscaping, snow removal, parking lot upkeep, security, common utilities, insurance and often property taxes, though some leases bill taxes and insurance separately.
- Estimates. Each tenant pays one twelfth of its estimated share every month with the rent.
- Actuals. After year end, the landlord totals what it actually spent in each recoverable category.
- True-up. Each tenant's share of actuals is compared with what it paid. The difference is billed or credited, usually within a deadline the lease sets, often 90 to 120 days after year end.
What the lease controls
The reconciliation is only as good as the clause it applies. Five terms move the number most.
| Term | What it does | Effect on recovery |
|---|---|---|
| Pro rata share | Tenant area divided by the property or pool area | Sets the base share |
| Gross-up | Adjusts variable costs as if the building were, say, 95% occupied | Lets the landlord recover more in a half-empty building |
| Exclusions | Costs the tenant never pays: capital items, leasing commissions, management above a cap | Leaves those costs with the landlord |
| Caps | Limit on how much controllable CAM can rise each year | Costs above the cap stay with the landlord |
| Anchor contribution | A fixed amount or a low share for the largest tenant | Shifts more of the pool to the landlord or the shops |
Add the audit right: many leases let the tenant inspect the landlord's books within a window, and some make the landlord pay for the audit if overcharges pass a stated percentage.
Where buyers lose money
A T-12 shows the recoveries the seller collected, not the recoveries the leases allow going forward. The usual gaps:
- a cap that has already been reached, so cost growth now stays with the owner;
- an anchor on a fixed contribution signed years ago;
- reconciliations billed late and written off;
- a tenant audit under way that may end in a refund.
On a triple net lease these gaps are exactly where "net" stops being net. Test them lease by lease before you capitalise the NOI.
How the lease terms get into the model
The terms above sit in the leases, not in the rent roll. A lease abstract built for acquisition pulls them out. In Titleman, uploaded leases each come back as 16 fields (rent, term, options, escalations and more), each with the page it came from, rolled into one rent-roll spreadsheet, and a term with no page reference is shown as a gap, never guessed. It reads text-layer PDFs only, so scanned leases need OCR first, and it is not a law firm: the abstract is a draft for a licensed professional to check.
FAQ
What is CAM reconciliation?
CAM reconciliation is the annual process in which a landlord compares the common area maintenance charges each tenant paid during the year, usually as monthly estimates, with the share of actual costs the lease allows the landlord to recover. The tenant then pays the shortfall or receives a credit for the overpayment.
When is CAM reconciliation done?
Usually within 90 to 120 days after the end of the landlord's fiscal year, though the deadline is whatever the lease says. Some leases bar the landlord from collecting a shortfall billed after the deadline, which makes late reconciliations a real loss.
How is a tenant's CAM share calculated?
Most leases use the tenant's pro rata share: its rentable area divided by the area of the property or of a defined pool. The lease may then adjust it with a gross-up for vacancy, exclusions for certain costs, a cap on annual increases, or a fixed contribution for an anchor tenant.
Why does CAM reconciliation matter to a buyer?
Because the T-12 shows what was recovered, not what the leases allow. Caps, exclusions, anchor contributions and missed reconciliations leave costs with the landlord, and a buyer who assumes full recovery overstates net operating income.
Can tenants audit CAM charges?
Many leases give the tenant a right to audit the landlord's books within a set window after the reconciliation statement, often with the landlord paying the audit cost if overcharges exceed a stated percentage. An open audit claim is a liability a buyer should ask about in estoppels.