How to Write a CAM Reconciliation Letter to Tenants

A CAM reconciliation letter serves two purposes simultaneously: it's a legal notice under the lease (triggering payment obligations and audit windows) and a practical communication to a tenant who needs to understand what they owe and why.

Most disputes start not because the math is wrong but because the letter is opaque enough that the tenant can't verify it. This guide covers what to include, how to format it, and how to write it in a way that speeds up payment and reduces escalations.

For the structural requirements of the reconciliation itself, see CAM expense reconciliation process and CAM reconciliation checklist.

The Letter's Legal Function

Before writing the first word, understand what the letter triggers legally:

It starts the tenant's audit window. Most leases give tenants 12 months from statement delivery to exercise audit rights. The day you deliver the letter is day one. This is why delivery confirmation matters — you need to prove when the clock started.

It creates a payment obligation. Most leases say the tenant must pay any true-up amount within 30 days of the statement. The statement is what triggers that obligation. A vague communication that doesn't clearly constitute a "statement" under the lease may not start the payment clock.

It may be non-binding if delivered late. If your lease requires statements by April 30 and you send it May 15, the tenant may reject the true-up demand entirely. The letter's timing is as important as its content.

See cam reconciliation timeline guide for deadline management.

Required Components

1. Header Information

Include at the top:

• Property name and address
• Suite number and tenant name
• Reconciliation period ("For the period January 1, 2025 – December 31, 2025")
• Date of the letter (not the date you prepared the reconciliation — the date you're sending it)
• Reference to the lease provision ("Pursuant to Section 7.3 of the Lease Agreement dated [date]")

The lease reference matters. Without it, some tenants will question whether the letter has any contractual effect.

2. CAM Pool Summary

Show the total recoverable expenses for the property. Itemize by category, not just total. A table works well:

The prior-year column is optional but high-leverage — it answers "why is this higher than last year?" for most tenants before they ask the question.

3. Pro-Rata Share Calculation

Show the math explicitly. Don't just state the percentage — show what it's based on:

Pro-Rata Share Calculation Tenant rentable area: 15,000 SF Total leasable area (per Lease Section 4.1): 270,000 SF Pro-Rata Share: 15,000 ÷ 270,000 = 5.556%

If the denominator excludes anchor tenant space per the lease, say so:

"The total leasable area denominator of 270,000 SF excludes 80,000 SF occupied by [Anchor Tenant] pursuant to Section 4.1(b) of the Lease."

This preempts the most common source of tenant disputes. See pro-rata share calculation for the full denominator methodology.

4. Gross-Up Disclosure (If Applicable)

If you applied a gross-up adjustment, disclose it clearly:

Gross-Up Adjustment Actual average occupancy for 2025: 78.4% Gross-up threshold per Lease Section 7.2(b): 95% Variable CAM expenses subject to gross-up: $542,000 Gross-up calculation: ($542,000 ÷ 0.784) × 0.95 = $656,122 Fixed expenses (not subject to gross-up): $535,000 Total adjusted controllable CAM: $1,191,122

Tenants who've never seen a gross-up clause applied will be confused by the higher number without this explanation. A plain-English sentence helps:

"Your lease provides that variable CAM expenses are adjusted to reflect 95% occupancy. Because the property averaged 78.4% occupancy in 2025, variable CAM costs have been adjusted to reflect a stabilized occupancy level. This adjustment reflects the intent of the lease to maintain predictable per-tenant costs regardless of overall building occupancy."

See cam gross-up calculation guide for the calculation methodology.

5. Cap Disclosure (If Applicable)

If controllable CAM exceeded the lease cap:

CAM Cap Calculation 2024 controllable CAM: $1,050,000 Cap rate per Lease Section 7.3: 5.0% Maximum 2025 controllable CAM: $1,102,500 2025 actual controllable CAM (after gross-up): $1,191,122 Cap applied: Yes — controllable CAM reduced to $1,102,500

6. Tenant's Annual Charge

Your 2025 CAM Charge Total recoverable pool (after adjustments): $2,102,500 Your pro-rata share: 5.556% Your 2025 CAM charge: $116,815

7. Reconciliation Table

Reconciliation Against Estimate Payments 2025 CAM charge: $116,815 2025 monthly estimates paid (12 × $9,000): ($108,000) Balance Due: $8,815

or:

Balance (Credit): ($4,200) Credit will be applied against your March 2026 rent installment.

8. Payment Instructions

State:

• The exact amount due (or credit amount)
• The payment due date (date of letter + 30 days, or per lease terms)
• How to remit (check payable to X, wire instructions, or property management portal)
• Who to contact with questions

9. Audit Rights Notice (Optional but Recommended)

Many landlords include a reminder of the tenant's audit rights:

"Pursuant to Section 12.4 of the Lease, you have the right to inspect the books and records supporting this statement within 12 months of the date of delivery of this letter."

This seems counterintuitive — why remind tenants of their audit rights? Because tenants who know about the right are less likely to assume it's being hidden from them, and landlords with accurate reconciliations have nothing to fear from the reminder.

Tone and Language

What Works

Direct and factual: "Your 2025 CAM charge is $116,815, representing a 4.2% increase over your 2024 charge of $112,100." This states the fact, gives context, doesn't hedge.

Specific citations: "Pursuant to Section 7.2(b) of your lease" is more persuasive than "as required by the lease." Specificity signals that you've reviewed the documents.

Proactive explanation: "The 9.4% increase in landscaping costs reflects a new contract for irrigation maintenance not in place in 2024." Give the reason before the tenant asks — it's faster for both parties.

What Doesn't Work

Vague explanations for large increases: "Costs continued to rise across the portfolio" explains nothing and invites more questions.

Apologetic language for correct charges: If the math is right and the charges are lease-compliant, don't apologize for them. "We appreciate your understanding" reads as defensive.

Jargon without explanation: "The gross-up threshold was applied per Section 7.2(b)" tells a tenant nothing. Explain what it means in plain terms.

Handling a Credit

Credits are logistically more complex than charges. A tenant who overpaid estimates expects to see that money back promptly.

In the letter, specify:

• The credit amount and how it was calculated
• How it will be applied (credit against next rent installment is most common; check refund is sometimes required at lease expiration)
• The timing ("This credit will be applied against your April 2026 rent installment, due April 1, 2026")

If the tenant is near lease expiration, a check refund may be required. State the timing: "We will remit this credit by [date] via [method]."

Delivery and Timing

Send by a method that creates a delivery record. Certified mail with return receipt is the traditional standard. Email with read receipt is increasingly accepted in leases executed after 2015 — but verify your lease before relying on it.

Log the delivery date and method in the property file alongside a copy of the statement. If a tenant exercises audit rights in month 11 and disputes whether the window has passed, you'll need that log.

When a Tenant Disputes the Letter

The best way to handle a dispute is to have anticipated it in the letter. When your letter includes itemization, year-over-year comparison, pro-rata share math, and any adjustments explained plainly, most tenant questions resolve at the informal level.

For formal disputes — when a tenant sends a written objection or exercises audit rights — the cam charges dispute process and cam reconciliation letter tenant guide cover the landlord's and tenant's respective next steps.

For the specific documentation to assemble when a dispute escalates, see defensible reconciliation package.