Chapter 2 · CAM reconciliation

How to read a CAM reconciliation

Guide · August 2026 · Not legal or accounting advice

A CAM reconciliation is the year-end process of matching estimated common-area charges to actual recoverable costs. The statement you receive is the landlord’s version of that math. This chapter walks the statement the way a careful tenant would — not toward a “standard” CAM rate, and not as an audit.

If you only need the definition of the settlement dollars, start with what a CAM true-up is. The calculator on this site is a CAM reconciliation calculator: it reconstructs the sequence below from the figures on the letter. Worked numbers use only the labeled homepage sample. They are examples.

1. Calendar and the objection / audit window

Open the lease before you open the spreadsheet. Find the paragraph that says when the landlord must deliver the annual statement, and the paragraph that says how long you have to object or to inspect books and records. Those two clocks are contractual. They are not courtesy. Missing the tenant window can waive a challenge even if a line is wrong.

Write down four dates: the last day of the CAM year, the date on the letter (or the date you actually received it, if the lease runs from receipt), the last day to request backup, and the last day to send a written objection. If the lease requires the objection to name specific items, a general “we disagree” may not preserve the claim. Some forms require you to pay the billed amount while the challenge proceeds. Some do not. This site does not tell you whether your window is open. Read the clause or ask counsel.

Fiscal years differ. A calendar-year shopping center and an office building with a June 30 year-end are not on the same clock. A mid-year assignment or a new manager can delay the packet. Delay does not always kill the landlord’s claim, and it does not always extend yours. The lease controls.

2. Denominator: GLA versus rentable versus stipulated

Pro-rata is a fraction. The numerator is usually your premises — the square feet on your rent exhibit, sometimes plus storage or a mezzanine the lease adds. The denominator is the building figure the lease names. Names vary.

• GLA (gross leasable area) is common in retail: the area designed for tenant occupancy. Whether it includes vacant bays, pads, and majors that do not pay CAM is a lease question.
• Rentable area is common in office: your usable area plus a share of common corridors, restrooms, and the lobby. The load factor that produced your rentable SF is not the same thing as the CAM denominator, though they can be related.
• Stipulated or “deemed” area is a number written into the lease that does not change when a bay goes dark. It protects the landlord from a shrinking denominator, and it protects you from a surprise increase in share if the landlord later remeasures.

Vacant space is the usual fight. If the denominator shrinks when a neighbor leaves, your share rises even if your premises did not change. Many leases freeze the denominator, or require vacant space to stay in it, so remaining tenants do not fund empty corridor. Some exclude a major that maintains its own parcel. Some add a storage or basement number that is not on your rent exhibit. If the statement’s share does not match tenant SF ÷ stated GLA, ask which area they used and who is in the building for CAM purposes.

We do not substitute a typical percentage. There is no market “standard CAM %.” In the homepage sample the fraction is 8,500 ÷ 100,000 = 8.5%. That 8.5% is an example, not a recommendation.

3. Recoverable pool versus raw GL spend

The general ledger is a list of what the property spent. The recoverable pool is the subset the lease lets the landlord pass through. Those are different documents. A one-page rollup that says “CAM $420,000” is a conclusion. The work is how $420,000 was built: which accounts, which exclusions already removed, which capital items amortized, which invoices sit in “repairs.”

Start from the definition of Operating Expenses or CAM, then the exclusions exhibit, then the statement. A line on the statement is not automatically recoverable. A line missing from the statement is not automatically excluded — the landlord may have already taken it out. Ask for the list of exclusions they removed. Then mark anything that still looks like a commonly questioned cost.

Related-party vendors and double recovery belong here, not later. If the management company and a landscaping affiliate share an owner, the markup is a lease question. If an insurer, a warranty, or a single tenant already paid for a repair, that amount should not also sit in the shared pool. See operating-expense pass-throughs for the OpEx-level version of the same problem.

4. Gross-up: variable versus fixed

Gross-up restates variable expenses as if the building had been occupied at a lease threshold. The idea is that a half-empty building still needs a roof and a tax bill (fixed), but it needs less janitorial and less common-area electricity (variable). If occupancy is low and variable costs are not grossed up, a tenant at 8.5% of GLA would pay 8.5% of a depressed janitorial bill — less than the lease may have contemplated. If occupancy is low and fixed costs are grossed up, remaining tenants are asked to pay more than 100% of a cost that did not shrink.

Many leases write a 95% target. That is a lease term, not a market law. Some write 90% or 100%. Some have no gross-up at all. Occupancy support — a month-by-month certificate or a rent roll the landlord used — is how you test the percentage. If the statement applies a gross-up to the entire pool, that is a question, not a given.

5. Admin / management fee

Leases often allow a percentage fee on a defined base, in lieu of or in addition to on-site payroll. The fights are the base, the stacking, and the order.

• Base. Controllable operating expenses are a common base. Taxes and insurance are frequently carved out. Some leases allow the fee on “all operating expenses.” The statement should show the base, not only the resulting dollars.
• Stacking. If an on-site manager’s salary is already in the pool, and the fee is calculated on a base that includes that salary, you are paying the salary and a percentage of the salary. Some leases allow that. Some treat the fee as a substitute for off-site overhead and still allow on-site payroll. Stacking a fee on the same people’s salaries is a frequent question. So is a fee plus a separate “administrative” salary at the region.
• Before or after gross-up. A fee calculated after gross-up is a fee on a restated number, not on cash spent. This site’s calculator charges the fee on controllable CAM after gross-up, which matches a common lease sequence. Your lease may reverse the order. Ask which one they used.

We never assume a market fee percentage. The 4% in the homepage sample is an example.

6. Controllable cap

A cap usually limits how much controllable CAM can rise year over year. Non-controllable items — often real-estate taxes, insurance, and sometimes utilities or snow — sit outside the cap and pass through. The statement should show three numbers: prior-year controllable CAM, this year’s controllable CAM (after the adjustments the lease applies), and the cap percentage. If those three are missing, you cannot check the cap.

What sits outside the cap is a definition fight. Tax and insurance are the usual carve-outs. A landlord that folds tax into “CAM” and then applies the cap to the combined number is either doing you a favor (if costs rose) or hiding a non-controllable increase inside a capped bucket (if they also moved something the other way). Split the buckets.

We never assume a 3% or 5% “market” cap. The 5% and the $390,000 prior-year figure below are the homepage sample.

7. Sequence of operations

Order matters. Share, gross-up, fee, cap, allocate, subtract estimates — applied in the wrong order, the same inputs produce a different true-up. This site’s calculator uses the sequence below. Confirm it against the lease. Some forms cap before the fee, or allocate before gross-up. Reconstruct theirs, then compare.

1. Pro-rata % = tenant SF ÷ building GLA (or other lease denominator).
2. Gross-up variable expenses if occupancy is below the target.
3. Admin / management fee on controllable CAM (after gross-up, in this sequence).
4. Cap on the controllable year-over-year increase only.
5. Allocate the recoverable pool by pro-rata.
6. True-up = allocated CAM − estimates paid. Positive = tenant owes. Negative = credit.

8. Backup request list

The cover letter is a summary. The backup is how you test it. You do not need every invoice on day one. You do need enough to reconstruct the sequence above and to mark exclusions. A typical written request:

• General ledger or chart of accounts for the CAM year, not a one-page rollup.
• Invoices (or a sample) for the largest vendors and any related-party vendors.
• Occupancy certificate or month-by-month occupancy used for the gross-up, and the variable / fixed split.
• The admin / management fee calculation, including the base and whether it is before or after gross-up.
• Prior-year controllable CAM if a cap applies, with the same definition used this year.
• A list of exclusions the landlord already removed.
• Support for any amortized capital: original cost, useful life, start date, and the lease clause that permits it.
• Insurance declarations, premium invoices, and a statement of proceeds or recoveries credited to the pool.

Send the request inside the lease window, even if you will not finish reading the invoices this week. A request that arrives after the deadline can be rejected as untimely. Keep a copy.

9. What to do in the first hour versus later

First hour. Find the objection date and calendar it. Confirm tenant SF and the denominator against the lease exhibit. Recompute pro-rata. Tick estimates paid to your AP or bank records. Note whether the statement shows occupancy, a gross-up, a fee base, a prior-year controllable, and a cap percentage. If any of those is used but not shown, write it on the backup list immediately. Skim the five largest cost lines for names that look like capital, vacancy, related-party, or a recovery.

Later, still inside the window. Read the definition and the exclusions exhibit against the general ledger. Test gross-up with occupancy support. Recalculate the fee and the cap in the lease’s order. Mark exclusion candidates. Type the landlord’s figures into the free calculator so you can see the headline true-up the same way this chapter just did. The optional $79 packet is a two-page worksheet — line-item math plus a blank exclusion checklist — not an audit and not a subscription. Use it as a worksheet you can email or take to the meeting.

Do not wait for a perfect file. A dated, specific written objection that names the denominator, the fee base, and three ledger lines is more useful than a polished memo that arrives late.

10. Office versus retail versus industrial — high level

The math does not change by asset class. The vocabulary and the usual fights do. This is descriptive, not a statute, and not a claim that your form looks like anyone else’s.

• Office. Base-year and expense-stop structures are more common than a full NNN pass-through. Gross-up language is often detailed because occupancy swings and janitorial is a large variable. The denominator is often rentable area, and remeasurement clauses matter. After-hours HVAC is frequently a direct charge, not CAM — it should not also sit in the pool.
• Retail. GLA, vacant-bay treatment, and majors that do not participate are the usual denominator issues. Parking-lot, landscaping, and seasonal weather show up as controllable lines. Marketing or merchants-association charges may be separate from CAM; if they are in the pool, check the lease. A pad that maintains its own parcel may be out of both the numerator and the denominator.
• Industrial. Triple-net is common. The tenant often maintains its own premises; CAM is a thinner common-area and park-level set (roads, detention, signage, snow). Tax and insurance can dwarf CAM. The NNN true-up chapter is often the better label for the envelope. Gross-up may be thin or absent if there is little variable common-area spend.

Do not invent a recovery rate from the sign on the building. A “NNN industrial” lease can still have a base year. A “gross” office lease can still pass through tax increases. Read the definitions.