Whether CAM includes property taxes depends on how your lease is written, but the usual pattern is simple: in a triple net (NNN) lease, property taxes are passed through to you as part of CAM or a closely related “Additional Rent” charge; in a gross lease, property taxes are baked into your base rent and don’t appear as a separate line; in a modified gross lease, you often pay taxes only above a base-year threshold. The controlling answer sits in the lease’s definitions of “Operating Expenses,” “Real Estate Taxes,” and “Additional Rent,” not in the label “CAM” itself.
How Each Lease Type Handles Property Taxes
The lease structure is the single biggest factor in whether property taxes show up on your monthly statement.
In a triple net lease, you pay base rent plus a separate, variable amount covering property taxes, insurance, and maintenance. Property taxes are explicitly part of your pass-through expenses, and if the local tax rate rises, your monthly bill rises with it.
In a gross lease, the landlord folds operating costs, including property taxes, into a single fixed rent payment. You don’t see taxes broken out, but the base rent is typically higher because the landlord is absorbing the risk of future tax increases.
A modified gross lease splits the difference. You might pay a flat rent that covers property taxes up to a set threshold, with any increase above that amount becoming your responsibility. These agreements often use the first year’s tax bill as the benchmark, so future increases fall to the tenant.
Where to Find the Answer in Your Lease
Three sections of the document control your exposure. Read them together.
Start with any clause titled “Operating Expenses” or “Real Estate Taxes.” These typically define what the landlord treats as a reimbursable expense and whether the definition reaches ad valorem taxes (taxes based on property value), special assessments, and government fees. Then check “Additional Rent,” which usually lists the specific components of your monthly CAM payment. Finally, review the definitions section near the front of the lease; terms like “Taxes,” “Operating Costs,” and “Common Area Expenses” are often defined there in ways that quietly expand or limit what you owe.
Focus on the words “inclusions” and “exclusions” within these sections. A well-drafted lease states clearly whether the tenant reimburses the landlord for a proportionate share of all real property taxes, and whether special assessments or capital improvement charges are carved in or out. If the language is ambiguous, ask for a detailed breakdown of the prior year’s actual expenses before you sign. The letter-of-intent stage is the best window to negotiate limits on tax exposure.
How Your Share of the Tax Bill Is Calculated
When taxes are passed through, each tenant pays a pro rata share. The basic math divides the square footage of your space by the total leasable square footage of the building, producing a percentage that is then applied to the tax bill. If you occupy 2,000 square feet in a 10,000-square-foot shopping center, your pro rata share is 20 percent. On a $50,000 annual tax bill, that’s $10,000 for the year, usually collected monthly.
GLA vs. GLOA
The denominator matters more than most tenants realize. Leases use one of two measurements. Gross Leasable Area (GLA) includes all leasable space in the building, occupied or not. Gross Leasable Occupied Area (GLOA) counts only space with a current tenant.
If a building is 80 percent occupied and your lease uses GLOA, the denominator shrinks, and your percentage of the tax bill goes up. A lease using GLA keeps your percentage the same regardless of vacancies, because the landlord absorbs the cost of empty suites rather than spreading it across the remaining tenants. Check which measurement your lease uses before you sign.
Base Year Stops
Some leases use a base year stop to limit tax exposure. The landlord establishes a benchmark using property taxes paid during the first year of the lease. In later years, the tenant pays only a pro rata share of any increase above that base year amount. If taxes stay flat or decrease, the tenant owes nothing beyond base rent for that category.
For example, if base year taxes totaled $100,000 and rose to $115,000 the next year, tenants collectively cover the $15,000 increase, and the landlord continues to carry the original $100,000.
CAM Caps Usually Don’t Apply to Taxes
Many commercial leases cap year-over-year CAM increases, often at 3 to 5 percent. These caps generally apply only to “controllable” expenses the landlord can manage, such as landscaping, janitorial services, management fees, security, and general repairs.
Property taxes are treated as “uncontrollable” because the landlord has no say in what the local government assesses. Taxes, along with insurance premiums, utilities, and sometimes snow removal, are typically excluded from CAM cap calculations. Even with a 4 percent annual cap on CAM increases, a jump in your municipality’s assessment can flow through to you in full. Whether property taxes fall inside or outside the cap is one of the most important negotiation points in the lease.
Special Assessments Are a Separate Question
Regular property taxes and special assessments are not the same thing, and your lease may treat them differently. Regular property taxes are calculated annually based on assessed value. Special assessments are separate charges imposed when a specific public improvement benefits the property, such as sewer upgrades, sidewalk construction, or streetlight installation. They are usually fixed amounts tied to project cost, paid in annual installments over several years.
Some leases lump both into a single “Real Estate Taxes” definition and pass both through. Others exclude special assessments from CAM and leave those charges with the landlord. Look for language covering “special assessments” or “governmental charges” in the tax definition; that phrase determines your exposure.
Reconciliation and Your Right to Audit
Most landlords bill CAM monthly based on estimates set at the start of the year using the prior year’s actual expenses plus anticipated increases. At year end, the landlord reconciles estimates against actual costs. If actual costs exceeded the estimates, you get a bill for the shortfall. If you overpaid, you should receive a credit or refund. Tax reconciliations are especially common because assessments can shift mid-year through reassessments, successful appeals, or supplemental bills. A tenant who budgets only for the monthly estimate can be caught by a significant true-up.
When the reconciliation arrives, compare it against the actual municipal tax bill for the property. The numbers should match your pro rata share.
Errors are common enough that many commercial leases include an audit rights clause letting you review the landlord’s books to verify property tax charges and other operating expenses. A typical clause specifies who performs the audit, who pays for it, and how discrepancies are resolved. Most leases require you to exercise the right within a set window after the annual reconciliation statement, commonly 60 to 180 days. If the audit reveals an overcharge above a threshold (often 3 to 5 percent), the landlord is generally required to reimburse the overpayment and sometimes cover the audit’s cost.
Even without an explicit audit clause, you can ask the landlord for the property tax statement from the county assessor’s office. The total tax divided by the building’s leasable area should produce a number consistent with what you’re being charged. If a landlord is combining tax bills from multiple parcels or inflating the total, an audit is the main way to catch it.
Challenging the Assessment Itself
If the property tax assessment seems unreasonably high, you may be able to challenge it, though the process is more complex for tenants than for owners. In most jurisdictions, the right to appeal belongs to the property owner. A commercial tenant contractually obligated to pay property taxes during the lease term may qualify as a “party in interest” entitled to seek a review.
You’ll typically need to notify the landlord first, because the challenge is filed in the property owner’s name with the county assessment office. Courts weighing a tenant’s right to file in the landlord’s name generally consider lease duration, the size of the tax burden on the tenant, and whether the tenant will adequately represent the landlord’s interests.
Reassessment schedules vary. Some jurisdictions reassess annually; others run cycles of three to eight years. A reassessment year is the most likely time for a large jump in your CAM bill and the best opportunity to challenge the assessed value if comparable properties are assessed lower. Appeal deadlines are strict, often 30 to 45 days after the assessment notice is mailed, so acting quickly matters.