Commercial Lease Glossary
Plain-English definitions of the CAM and commercial lease terms you'll encounter in your reconciliation statement.
A
Anchor Tenant
A large, high-traffic tenant — typically a national chain or department store — that draws customers to a shopping center or commercial property. Anchor tenants often negotiate favorable lease terms, including exclusions from certain CAM charges or reduced pro-rata share obligations. Their presence affects the allocation of CAM costs among other tenants.
Related: Pro-Rata Share, CAM (Common Area Maintenance)
Audit Rights
A lease provision giving tenants the contractual right to inspect, review, and verify a landlord's CAM records and reconciliation calculations. Audit rights typically specify the timeframe within which an audit must be initiated (often 12 months after receiving the annual reconciliation statement) and what records the landlord must make available. This right is the legal foundation for any CAM dispute.
Related: CAM Reconciliation, CAM (Common Area Maintenance)
B
Base Year
A reference year used in gross leases and modified gross leases to establish a baseline for operating expenses. The tenant pays increases in CAM, taxes, and insurance above the base year's actual costs. If the landlord misrepresents or manipulates the base year expenses — for example, by using artificially low figures — tenants end up paying inflated escalation amounts in subsequent years.
Related: Gross Lease, Operating Expense (OpEx), CAM Cap
C
CAM (Common Area Maintenance)
Charges that commercial tenants pay for the maintenance and operation of shared spaces in a property, including parking lots, lobbies, corridors, landscaping, elevators, and HVAC systems serving common areas. CAM charges are typically passed through to tenants on a pro-rata basis as part of NNN or modified gross leases. Overcharges are common and often result from improper expense categorization, mathematical errors, or lease term violations.
Related: NNN Lease (Triple Net Lease), Pro-Rata Share, CAM Reconciliation
CAM Cap
A lease provision that limits how much controllable CAM expenses can increase from one year to the next, often expressed as a percentage (e.g., 5% annually) or tied to CPI. CAM caps protect tenants from runaway cost escalation. A "cumulative" cap allows unused capacity to roll forward; a "non-cumulative" cap resets each year. Violations occur when landlords charge increases that exceed the contractual cap.
Related: Controllable Expenses, CAM (Common Area Maintenance), CAM Reconciliation
CAM Reconciliation
The annual process by which a landlord compares estimated CAM charges paid monthly by tenants against actual CAM expenses incurred during the year. If actual costs exceeded estimates, tenants owe the difference (a "true-up"). If estimates were too high, tenants receive a credit or refund. Errors in reconciliation statements — including miscalculations, improper expense inclusions, and inflated management fees — are the primary targets of a CAM audit.
Related: CAM (Common Area Maintenance), Pro-Rata Share, Management Fee
Capital Expenditure (CapEx)
Money spent on acquiring, improving, or extending the useful life of a long-term asset — such as replacing a roof, installing a new HVAC system, or repaving a parking lot. Most commercial leases explicitly exclude capital expenditures from CAM charges, requiring that such costs be absorbed by the landlord or amortized over the asset's useful life. Landlords who include CapEx in CAM statements are overcharging tenants in violation of the lease.
Related: Operating Expense (OpEx), CAM (Common Area Maintenance)
Controllable Expenses
CAM expenses that the landlord can directly influence through management decisions, such as landscaping contracts, janitorial services, security, and administrative costs. CAM caps typically apply only to controllable expenses — not to uncontrollable ones like property taxes, insurance premiums, and utility rates. Properly distinguishing controllable from uncontrollable expenses is critical when evaluating CAM cap compliance.
Related: CAM Cap, Operating Expense (OpEx)
G
Gross Lease
A lease structure where the tenant pays a single, all-inclusive rent amount and the landlord is responsible for paying all property operating expenses including taxes, insurance, and maintenance. Gross leases are the opposite of NNN leases. Tenants in gross leases should not be billed for CAM charges; any such billing constitutes an overcharge. Some leases are "modified gross," where only specific expenses are excluded from tenant responsibility.
Related: NNN Lease (Triple Net Lease), Base Year, Operating Expense (OpEx)
Gross-Up Clause
A lease provision allowing landlords to adjust variable operating expenses as if the building were fully occupied (typically 90–100%), even when actual occupancy is lower. The intent is to prevent landlords from being underpaid for fixed costs when vacancy is high. However, gross-up clauses are frequently misapplied: landlords sometimes gross up expenses that are fixed regardless of occupancy, or apply higher occupancy percentages than permitted, resulting in overcharges to tenants.
Related: CAM (Common Area Maintenance), Pro-Rata Share, Operating Expense (OpEx)
M
Management Fee
A charge included in CAM expenses representing the landlord's or property manager's fee for administering the property. Management fees are typically expressed as a percentage of gross revenues or total operating expenses (commonly 3–5%). Leases often cap this fee, and the base on which the percentage is calculated is frequently a source of disputes. Landlords sometimes compute the fee on a higher base than the lease permits, or include charges that should be excluded from the calculation.
Related: CAM (Common Area Maintenance), CAM Reconciliation, Operating Expense (OpEx)
N
NNN Lease (Triple Net Lease)
A commercial lease structure in which the tenant pays base rent plus three additional categories of property costs: property taxes, building insurance, and operating expenses (including CAM). Triple net leases shift most property cost risk to tenants, making accurate reconciliation critical. NNN tenants are responsible for verifying that only legitimately passable expenses appear in their CAM statements.
Related: CAM (Common Area Maintenance), Gross Lease, Pro-Rata Share
O
Operating Expense (OpEx)
Day-to-day costs required to run a property, as opposed to capital expenditures on long-term assets. Operating expenses include utilities, maintenance, janitorial services, landscaping, insurance, property management fees, and property taxes. In NNN leases, operating expenses are passed through to tenants as CAM charges. Whether a specific expense qualifies as an operating expense or must be excluded depends on the lease language.
Related: Capital Expenditure (CapEx), CAM (Common Area Maintenance), Controllable Expenses
P
R
Rentable Square Footage (RSF)
The total area of a tenant's leased space as measured for rent and CAM allocation purposes, which typically includes the tenant's usable floor area plus a proportionate share of common areas (corridors, restrooms, lobbies). RSF is the numerator in pro-rata share calculations. Discrepancies between the RSF stated in the lease and what is used in CAM reconciliations — or errors in the total building RSF used as the denominator — can result in systematic overcharges across multiple years.
Related: Pro-Rata Share, CAM (Common Area Maintenance)