The CAM charge audit every Manhattan commercial tenant should perform
Common area maintenance charges add 30–50% to base rent. A 2025 review found an average 11.4% overcharge across NYC office leases, but tenants have just 60–90 days to audit.
Common area maintenance charges—the cost of operating shared building spaces—can add 30 to 50 percent to a tenant's base rent, yet many Manhattan commercial tenants never challenge the numbers. A professional review of 212 NYC office leases in 2025 found an average CAM overcharge of 11.4 percent, suggesting that on a $50,000 annual CAM bill, a tenant could recover roughly $5,700 in a single year.
The problem is structural: New York State has no statutory audit rights for commercial tenants. Every right to examine landlord records must be negotiated into the lease itself, and the window to exercise that right is brief. Tenants who miss it forfeit their ability to dispute the charges, even if they later find them inflated by 25 percent or more.
What CAM charges actually cover
CAM includes a landlord's costs for operating common areas: lobbies, hallways, elevators, parking areas, security, utilities for shared spaces, janitorial services, landscaping, and property management. Some leases also include building insurance and real estate taxes, though the lease should specify what is and is not included in the CAM pool.
The typical breakdown allocates roughly 15 to 25 percent of CAM to utilities for common areas, 10 to 20 percent to cleaning and trash removal, and the remainder to security, management, maintenance, and insurance. Property management fees alone commonly run 4 to 6 percent of total operating expenses, and that fee can be included in the CAM pool that tenants reimburse on a pro-rata basis.
Because tenants pay their proportionate share—usually calculated by occupied square footage divided by total building square footage—even a 5 percent error in the landlord's expense calculation can cost a tenant hundreds or thousands of dollars annually.
The five overcharge patterns tenants miss
A review of NYC office lease audits identified five recurring overcharge patterns. The most common, and the single largest source of CAM overcharges, occurs when landlords calculate the management fee on gross rent rather than only on CAM costs. A management fee of 5 percent on gross rent inflates the actual fee by 4 to 5 times compared to a 10 to 15 percent fee calculated on CAM costs alone.
The second pattern involves capital improvements—like HVAC upgrades, roof repairs, or building system replacements—being miscoded as routine operating expenses rather than one-time capital costs. The lease should exclude capital improvements from the CAM pool, but landlords sometimes blur that line. Third, some leases allow property management and administrative overhead to exceed market rates without a specific cap. Fourth, landlords may charge above-market rates for services provided by affiliate vendors—cleaning, landscaping, or maintenance companies in which the landlord has a financial interest. Fifth, discretionary amenity upgrades like lobby redesigns or lobby art installations sometimes get charged to CAM without explicit tenant approval.
Tenants without a detailed lease definition of what qualifies as CAM cannot effectively challenge any of these practices.
The 60–90 day audit window
If the lease includes audit rights—and not all do—the window to exercise them is typically 60 to 90 days from the date the landlord provides the annual CAM reconciliation statement. This deadline is almost always contractual, not statutory. Miss it, and you generally lose the right to dispute that year's charges, even if a professional audit later reveals errors.
At the end of each lease year, the landlord provides a reconciliation statement comparing the estimated CAM charges the tenant paid monthly against the actual expenses incurred. The statement should show what was billed, what was actually spent, and whether the tenant is owed a credit or owes additional rent. The deadline for providing this statement varies by lease but commonly falls within 90 to 120 days of year-end.
Upon receiving the statement, a tenant should request detailed backup documentation: invoices from service vendors, payroll records for building staff, insurance certificates, and utility bills for common areas. Landlords are obligated to provide this documentation in writing if the lease grants audit rights. If the landlord refuses or delays, that refusal itself may be grounds for dispute.
“A management fee of 5 percent on gross rent inflates the actual fee by 4 to 5 times compared to a 10 to 15 percent fee calculated on CAM costs alone.”
Conducting the audit and challenging overcharges
Professional CAM auditors typically identify overcharges of 5 to 15 percent, with some exceeding 25 percent in poorly managed properties. The audit involves verifying that every line item in the reconciliation statement (1) is permitted under the lease definition of CAM, (2) reflects actual expenses incurred and not allocated costs, (3) is calculated correctly, and (4) is allocated to the tenant fairly based on the tenant's proportionate share.
Tenants should particularly scrutinize management fees, to ensure they are calculated on CAM costs only and not on base rent. They should verify that any increase from the prior year has clear justification. And they should confirm that items listed as 'administrative overhead' or 'property management' do not exceed 10 to 15 percent of total CAM, the typical market range.
If the audit reveals overcharges, the tenant can demand repayment from the landlord in writing. If the landlord disputes the finding, the tenant may file a declaratory judgment action under New York law. However, New York's civil practice law allows a six-year look-back period under CPLR § 213(2) for breach of contract claims, meaning a tenant can potentially recover overcharges from up to six prior years if they can prove a pattern of improper billing.
Importantly, commercial tenants in New York do not enjoy the same statutory protections as residential tenants. The entire relationship between landlord and tenant on CAM matters is governed by what the lease says, not by statute. This asymmetry makes careful review and negotiation of audit rights essential before signing.
Negotiating for the future
When renewing a lease or negotiating a new one, tenants should insist on explicit audit rights with a window of at least 90 to 120 days from receipt of the annual reconciliation statement. They should require the landlord to provide detailed backup documentation upon request, and they should cap management fees and administrative overhead at specific percentages of CAM costs, not gross rent.
The lease should explicitly list what is excluded from CAM—particularly capital improvements, leasing commissions, marketing costs, and amenity upgrades. And it should define the tenant's proportionate share method clearly, so there is no ambiguity about how the tenant's share is calculated.
For tenants in buildings with multiple vacancies or significant tenant turnover, negotiating the right to audit should be non-negotiable. A landlord managing an under-occupied building may attempt to gross-up expenses—calculating them as if the building were fully occupied—and pass those inflated costs to remaining tenants. Audit rights, and the explicit right to review actual invoices, are the only check on that practice.
