What documents do you actually need for a CAM reconciliation?
More than the lease. Ten documents decide the number — amendments, side letters, the commencement date agreement, estoppels, the condominium declaration or REA, last year’s expense detail and last year’s schedule — and the lease is only the first of them.
A missing one doesn’t leave a visible hole in the file. It leaves a number that looks finished, gets signed, and is wrong — rarely by a rounding difference, and usually in the direction that costs money.
Why the lease alone isn’t enough
A lease I pulled apart recently put the tenant’s proportionate share at 15.16%. Nothing in the signed document suggested otherwise. Over the following years it was amended more than once: four floors added, the premises reshaped inside the building, the calculation base moved. None of that was in the folder I started with.
With the full amendment history in hand, the tenant’s actual share was 58.83% — close to four times the figure the lease alone would have produced, and under-billed for every year in between.
| Stated in the signed lease | 15.16% |
|---|---|
| After the two amendments | 58.83% |
| Understated by | 43.67 pp |
The filings behind that number — the lease, the commencement date agreement and both amendments — are taken apart in full in the earlier note: is the tenant’s pro-rata share still the right number?
This is the part nobody budgets for. The lease says what the deal was. It doesn’t say what the deal is, and by the time this year’s CAM is being reconciled, the answer can be four instruments away from the PDF in the folder.
What each document actually settles
| Document | What it settles | What goes wrong without it |
|---|---|---|
| Original lease | Base terms: share, cap, exclusions, base year | Terms that stopped being current years ago, read as though they still are |
| Amendments, addenda, letter agreements | Any change to share, cap, base year or exclusions made after signing | The most common source of material error, and the hardest one to see from inside the folder |
| Side letters | Off-lease agreements: concessions, exclusivity, informal carve-outs | A term the tenant cites in the dispute that nobody on your side has read |
| Commencement date agreement | The date the term and the base year actually start | The base year lands on the wrong calendar year, and every escalation after it inherits the error |
| License and parking agreements | Space and use rights outside the demised premises | Square footage and recoverable costs that don’t match what is actually occupied |
| Estoppel certificate, SNDA | The tenant’s own certified statement of the terms as of a date | The one document that would have surfaced an undisclosed side deal or a default |
| Condominium declaration, REA | How costs are shared across the whole property, not just this lease | Shared costs allocated on an assumption instead of the governing document |
| Minimum assessment agreement | A floor obligation that can override the pro-rata result outright | A number that is legally too low no matter how clean the arithmetic is |
| Prior-year expense detail | What was billed last year, and how it was coded | No way to catch a cost sitting in the wrong pool |
| Prior-year reconciliation schedule | The number your predecessor produced, and the route to it | No baseline for this year’s number — your own history goes unchecked |
What to check in your own file before you trust it
- Does the lease itself reference an amendment, addendum, side letter or estoppel by date that isn’t in the folder?
- Is the commencement date driving the base year the one the documents fix, or an assumed move-in date?
- Does the pro-rata denominator match total leasable area, or does the lease carve anchor square footage out of it?
- Is there a minimum assessment or floor clause that overrides a pro-rata result below it?
- Is last year’s reconciliation schedule in hand to check this year’s number against, or does the year start from zero?
- For anything missing, does the file say “not provided” rather than assume “doesn’t exist”? Those are different facts, and only one of them is safe to sign under.
The honest version of this list
A folder without all ten isn’t a failed folder. It’s information, and it’s the most useful thing to hand whoever does the reconciliation: not the list of what you have, but the list of what you don’t.
Three gaps marked clearly beat a folder that looks complete and quietly reads missing as never existed. The first one can be closed with a phone call. The second one gets signed.
Amendments move cap language as often as they move square footage, and which of the three caps the clause actually describes decides the number: cumulative vs. compounding CAM cap, in dollars
Send the folder the way it is
Don’t sort it and don’t decide what’s relevant. What comes back is an inventory: what’s in there, what the lease references but the folder doesn’t contain, and what to go find before anyone trusts the number.
Send the folderNo charge, 48 hours. Redact names and rent if you’d rather — the recoverable-expense sections are the ones that matter.
Sources
Methodology follows BOMA International’s guidance on operating expense reconciliation and the lease administration standards of IREM (Institute of Real Estate Management). The amendment example comes from public filings with the U.S. Securities and Exchange Commission, found through EDGAR full-text search and linked document by document in the earlier note.