Mid-Year Tenant Move-Out: CAM Reconciliation for Vacated Space
A tenant who vacates on March 31 is not responsible for CAM expenses from April through December. But processing their final reconciliation correctly — and managing what their departure does to the rest of your pool — involves more moving parts than a standard year-end statement.
The most common error is waiting until year-end to deal with a mid-year move-out and then issuing a statement that covers the full calendar year. By then, the tenant may have disputes about the calculation, and if their security deposit has already been applied, recovering additional amounts is difficult.
The Two Reconciliation Scenarios
When a tenant vacates mid-year, you have two choices for when to issue the final reconciliation:
Scenario 1: Issue an immediate final reconciliation after vacancy. The advantage is speed — you close the relationship cleanly while lease terms are fresh and records are accessible. The disadvantage is that you're reconciling against estimated expenses for the partial year, because actual annual expenses won't be known until year-end.
Scenario 2: Issue the final reconciliation at the standard year-end cycle. The advantage is accuracy — you use actual expenses for the full year, then pro-rate for the tenant's occupancy period. The disadvantage is timing: you're issuing a statement to a former tenant months after they left.
Most commercial leases specify which approach applies, or set a deadline that effectively determines the timing. Check the lease before deciding. If the lease requires a reconciliation within 90 days of lease expiration, you're on Scenario 1. If it only requires annual statements, Scenario 2 may be appropriate.
Calculating CAM for Partial Occupancy
The calculation logic for a move-out is symmetric to a move-in. The formula:
Tenant's CAM Obligation = Full-Year CAM (Actual or Estimated) × (Days in Occupancy / Days in Year)
For a tenant vacating March 31 in a 365-day calendar year: days in occupancy = 90 days (January 1 through March 31).
$18,000 full-year actual CAM obligation × (90 / 365) = $4,438.36
From this, subtract the estimated CAM amounts the tenant paid during their occupancy period (January through March estimates). If they overpaid, issue a credit or refund. If they underpaid, issue an invoice.
Important: if you're reconciling in Scenario 1 (before year-end), use annualized actual expenses through the vacancy date, or the full-year budget, to estimate the full-year amount. Document your methodology clearly, because the tenant's representative may challenge it.
What Happens to Vacant Space in the Pool
When a tenant vacates, their square footage becomes vacant. This affects the remaining tenants in two ways depending on your lease structure.
Gross-Up Impact: If your leases include a gross-up provision and the vacancy pushes building occupancy below the gross-up threshold (typically 90–95%), the pool expenses can be grossed up to the threshold level. This means the remaining tenants may see their CAM obligations increase — which is the intended effect of gross-up, but it can trigger questions.
Be prepared to explain gross-up activation in your reconciliation statements. Tenants who haven't experienced it before may dispute it. Your lease language authorizing gross-up is your documentation.
Denominator Impact: If your pro-rata denominator is occupancy-based (total occupied SF rather than total rentable SF), the denominator shrinks when the tenant vacates. Each remaining tenant's pro-rata share increases as a result. This is correct and defensible — it's what occupancy-based denominators are designed to do — but it requires clear documentation in your reconciliation methodology.
Denominator Updates After Move-Out
Determine whether your leases use a fixed denominator (total building RSF) or a variable denominator (occupied RSF) before updating anything.
Fixed denominator leases: The denominator doesn't change when a tenant leaves. The vacant space simply represents a portion of the building that isn't recovering any CAM — which is the landlord's exposure, not the remaining tenants'.
Variable denominator leases: Remove the vacated tenant's SF from the denominator effective the day after their vacate date. Calculate the blended denominator for each period if multiple changes occur during the year.
In practice, most ERP systems calculate a weighted-average denominator for the year, which handles mid-year changes automatically if the lease end dates are configured correctly. Verify that the vacate date is entered accurately — it's the most common source of error in move-out calculations.
Security Deposit and CAM Settlement
If the tenant has a security deposit, the final reconciliation amount affects how it's applied.
If the tenant owes additional CAM (underpaid estimates relative to actual), the landlord typically applies the security deposit to cover it. This requires:
- A final reconciliation statement showing the amount owed
- A security deposit accounting letter specifying what portion was applied to CAM vs. other charges
- Return of any remaining deposit (with the required notice period under state law)
If the tenant is owed a CAM credit (overpaid estimates), that credit must be refunded from the security deposit return or separately, depending on lease terms and state law.
Never withhold a security deposit for a CAM dispute you haven't formally documented. Security deposit disputes are one of the most litigated commercial lease issues, and missing documentation creates significant exposure.
Common Errors in Mid-Year Move-Out Reconciliation
Sending a year-end statement to a tenant who left in March. This is the most common error — failing to recognize that the former tenant needs a final reconciliation, not a standard annual statement. They should not be on your standard reconciliation mailing list after their vacate date.
Using full-year actual expenses without pro-rating. The tenant owes CAM for their occupancy period only. Applying full-year expenses to a tenant who occupied the space for 90 days results in a 4x overbill.
Failing to remove the tenant's SF from occupancy-based denominators. If the denominator doesn't update at move-out, the remaining tenants' pro-rata shares are understated — a leakage problem for the landlord.
Miscalculating the security deposit application. Applying the entire deposit to CAM when other charges (holdover rent, repairs) should be itemized separately creates disputes and potential legal exposure.