CAM reconciliation guide
CAM Reconciliation Guide: True-Up, Pass-Throughs, Exclusions
This is one guide, in five chapters, plus three tools and checklists, for people who have a year-end CAM, NNN, or operating-expense statement in front of them and need to read it without guessing.
What this guide covers
Commercial leases rarely collect common-area and operating costs as a single invoice after the books close. They collect monthly estimates, then send a settlement. The settlement has a name that changes with the building: CAM true-up, CAM reconciliation, NNN true-up, additional-rent settlement, operating-expense reconciliation. The event is the same. The landlord states a recoverable pool, applies the lease’s share and adjustments, and subtracts what you already paid.
These chapters walk that event from the tenant side. They define the words, show the headline formula, then slow down on the statement itself: denominator, pool, gross-up, fee, cap, exclusions, and backup. Worked numbers use only the labeled homepage sample (GLA 100,000, tenant 8,500, actual CAM $420,000, estimates $32,000, occupancy 82%, gross-up 95%, admin 4%, prior $390,000, cap 5%). They are examples. They are not a building, not a market rate, and not a “standard CAM %.”
Who it is for
Controllers, office managers, tenant-rep brokers, and owners who pay additional rent and want to reconstruct the landlord’s math before they pay or credit it. You do not need to be a CAM auditor. You do need the lease (or the CAM exhibit) and the statement. If you have only the cover letter, the chapters still tell you what is missing.
What it is not
This is not legal, tax, accounting, or real-estate advice. It is not an audit. It does not create a professional-client relationship. It does not invent a typical recovery rate, a typical savings figure, or a jurisdiction’s statute. Office, retail, and industrial forms differ. Fiscal years differ. The lease wins. If you are in a dispute, get a lawyer.
How to use this guide
Read what a CAM true-up is for the definitions and the one formula. Then sit with how to read a CAM reconciliation. That chapter is the spine. Use operating-expense pass-throughs when the packet is labeled OpEx or additional rent rather than CAM. Use what an NNN true-up is when tax and insurance travel in the same envelope. Mark questioned lines against CAM exclusions. Use the first-hour checklist the day the packet lands, for bookkeepers when a client forwarded it, and CAM audit cost when you are deciding whether to hire. Then type the landlord’s figures into the free calculator on the homepage. The optional $79 packet is a two-page worksheet (line-item math plus a blank exclusion checklist), not an audit and not a subscription.
Chapters
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August 2026 · Chapter 1
What is a CAM true-up?Definitions of CAM, estimates, and the settlement. Why landlords bill monthly. When the letter usually arrives. The one formula, a worked example, and what the letter is not.
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August 2026 · Chapter 2
How to read a CAM reconciliationThe spine of this guide. Calendar and objection window, denominator, recoverable pool, gross-up, admin fee, controllable cap, sequence of operations, backup, and the first hour.
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August 2026 · Chapter 3
Operating-expense pass-throughsBase rent versus recoveries. Gross, modified gross, base-year, expense stop, and NNN as concepts. What often sits in OpEx, related-party vendors, and how the year-end statement settles.
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August 2026 · Chapter 4
What is an NNN true-up?Triple-net in practice: share of operating, tax, and insurance. Same settlement math. Property tax is not income tax. Insurance proceeds and self-insurance questions.
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August 2026 · Chapter 5
CAM exclusions tenants often look forA structured checklist of costs tenants commonly mark. Not universal law. The lease controls. Each item has why tenants look at it and what to request.
Tools and checklists
These pages sit next to the chapters. They are meant to be forwarded: a first-hour CAM rec checklist, a first pass for bookkeepers, and a cost comparison before you hire a CAM auditor. They are not a substitute for the $79 packet and not an audit.
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August 2026 · Checklist
Your CAM rec just arrivedA first-hour checklist a bookkeeper or tenant broker can print or forward: lease clauses to pull, statement lines to match, denominator, pool, gross-up, fee, cap, estimates, objection window, and backup.
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August 2026 · For bookkeepers
A client forwarded a CAM recWhat a bookkeeper or controller actually does in the first pass. Reconstruct the headline, match estimates to the books, send a short note back, and know when to stop. Not a CPA product.
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August 2026 · Cost
CAM audit cost versus a first-pass reconstructionProfessional CAM audits often run from the low thousands into the tens of thousands. Try the math first. $79 is a worksheet, not an audit. When to hire a consultant or a lawyer.
See the headline true-up from the landlord’s figures. Optional $79 packet if you want the two-page worksheet.