CAM Charges in Office Buildings: Benchmarks, Inclusions, and Negotiation

CAM Charges in Office Buildings: What Landlords Pass Through and Why It Matters

Office CAM is structured differently from retail or industrial CAM, and that distinction matters for both landlords managing reconciliations and tenants reviewing them. The dominant lease structure in office (the modified-gross or base year lease) means the CAM reconciliation calculates and bills only the excess above a baseline. Get the baseline right and everything else follows.

Office Lease Structures and CAM Mechanics

Unlike retail, where NNN leases are the norm, office buildings predominantly use three structures:

Full-service gross (FSG): Landlord pays all operating expenses. Tenant pays flat rent. No CAM reconciliation at all. Most common in multi-tenant Class A urban buildings where landlords want rent simplicity.

Modified-gross with base year: Tenant pays rent plus any increase in operating expenses above the base year amount. This is the most common structure for professional office in mid-size and suburban markets. The tenant's CAM exposure is the year-over-year increase, not the full operating cost pool.

NNN office: Less common, but exists, particularly in suburban single-tenant or two-tenant buildings. The tenant pays rent plus their full pro-rata share of all operating expenses, taxes, and insurance. CAM reconciliation looks similar to retail NNN.

Understanding which structure you're operating under is the first step to a correct reconciliation. For base year leases, you need the base year operating expense register (not just the current year) to calculate the pass-through correctly.

Typical Office CAM Expense Categories

Here's what office building operating expenses generally include, with benchmark context:

Janitorial and cleaning: Lobby, elevator cabs, common corridors, restrooms, loading dock, parking garage. In urban Class A buildings with union contracts, janitorial alone often runs $3.50–$6.00/SF/year. Suburban Class B is typically $1.50–$3.00/SF/year. This is a variable expense subject to gross-up.

HVAC maintenance and repair: Shared chiller plants, rooftop units serving common areas, building automation systems. Annual maintenance contracts plus parts and emergency service. Budget $0.80–$2.50/SF/year depending on system age and building complexity.

Common area utilities: Electricity for lobbies, corridors, parking, elevators, exterior lighting. Natural gas if the building has shared heating. In energy-intensive urban towers, this can reach $3.00–$5.00/SF/year. A variable expense for gross-up purposes.

Security: Building access control, security guard staffing, CCTV systems and monitoring. In urban Class A, 24/7 staffed lobbies add significant cost - $1.50–$3.50/SF/year is common. Suburban Class B security is often $0.40–$1.00/SF/year in electronic-only configurations.

Landscaping and exterior maintenance: More significant in campus-style suburban office than urban high-rises. Campus settings with extensive grounds: $0.30–$0.80/SF/year. Urban towers: minimal.

Management fees: Institutional landlords typically charge 3–5% of gross operating expenses. Some Class A urban buildings charge a fixed fee rather than a percentage. Tenants routinely scrutinize management fees because they're one of the easier costs to inflate.

Elevators: Service contracts, inspections, repairs. In a 20-story building, elevator maintenance is meaningful - $0.30–$0.80/SF/year depending on cab count and building age.

Insurance: The building's property and liability insurance. Passed through pro-rata. In high-risk markets (coastal, earthquake zones), this has increased substantially. Typical office range: $0.30–$1.20/SF/year, though coastal markets have seen this double in recent years.

Real estate taxes: Billed separately from operating expenses in most office leases. In high-tax urban markets like NYC or Chicago, taxes alone can be $8–$18/SF/year. Most base year leases use a separate tax base year.

The Gross-Up Calculation in Office Buildings

Gross-up is nearly universal in multi-tenant office buildings because variable costs (janitorial, HVAC, utilities) scale with occupancy. If the building is 75% occupied, the landlord is running HVAC and janitorial for 75% of the space, but a single tenant's pro-rata share is calculated against total square footage. Without gross-up, tenants would under-pay for the services they'd need at full building population.

The math: A 200,000 RSF office building is 82% occupied (164,000 SF leased). A tenant occupies 20,000 SF - 10% of total building. Variable operating expenses at 82% occupancy: $1,240,000. Grossed up to 95%: $1,240,000 / 0.82 × 0.95 = $1,436,585. The tenant's 10% share on the grossed-up base: $143,659 vs. $124,000 without gross-up.

The difference is $19,659 per year for this one tenant. Multiply across 15 tenants and you see why gross-up methodology matters.

Gross-up traps to watch for:

• Gross-up applied to fixed expenses (insurance, management fee, property taxes): should not apply
• Gross-up calculated to 100% occupancy instead of 95%: inflates the adjustment
• Gross-up applied to base year expenses but not current year, or vice versa: creates a mismatch that systematically over-charges tenants
• No disclosure of which expenses are grossed up vs. not

Exclusion Lists in Office Leases

Office tenants (particularly major tenants with legal representation) negotiate detailed exclusion lists that specify what cannot be included in the operating expense pool. Standard institutional office exclusions:

• Costs of capital improvements (see capital vs. maintenance below)
• Depreciation of the building or improvements
• Leasing commissions, advertising, and promotional expenses for the building
• Tenant improvement costs for any tenant
• Executive salaries of landlord personnel not directly involved in property management
• Costs reimbursed by insurance or third parties
• Ground rent or financing costs
• Costs arising from landlord's negligence or willful misconduct
• Fines and penalties

The more of these exclusions your lease contains, the more your reconciliation review should verify each category hasn't been included. Properties that lack formal exclusion lists (common in older office buildings with unsophisticated landlords) sometimes include items that institutional landlords would never attempt.

Capital vs. Maintenance in Office Buildings

The capital vs. maintenance boundary is contested in office as much as in industrial or retail. The common pressure points:

Elevator modernization: A full elevator cab replacement with new controls is capital. Annual maintenance contract is operating. But what about a $75,000 controller upgrade that extends useful life by 15 years? Most leases require amortization of capital items over their useful life; some require exclusion. Without clear lease language, landlords sometimes pass through large modernization projects as maintenance.

Roof replacement vs. roof repair: Same analysis as industrial. Routine patching is maintenance; full membrane replacement should be amortized. In a 500,000 SF office campus, a roof replacement can be $800,000+. Passing that through without amortization creates a $1.60/SF spike that tenants will challenge.

Building system upgrades: HVAC upgrades, building automation systems, LED lighting retrofits. These are often justified by energy savings, but they're capital if they extend useful life beyond the current operating condition. The landlord-favorable position is to pass them through as maintenance; the tenant-favorable position is to require amortization or exclusion.

Negotiating Power by Market Tier

Gateway urban Class A (NYC, SF, Boston, Chicago): Market is tight. Landlord negotiating power is high. Tenants rarely get broad exclusion lists or capital caps, but can negotiate audit rights, management fee caps (4% maximum), and clarity on gross-up methodology. Expense stop structures sometimes replace true base year, especially for shorter lease terms.

Suburban Class A: Tenants have a better bargaining position. Longer lease terms (7–10 years) give landlords flexibility to concede on exclusion lists, capital carve-outs, and caps on controllable expenses. Experienced tenants routinely negotiate controllable expense caps of 5–7% per year.

Suburban Class B: Most favorable tenant bargaining position. Landlords need to fill space; tenants with credit can negotiate full NNN exclusion lists, amortization requirements for capital, and below-market management fee caps. In soft suburban markets, some landlords accept a full expense stop that protects tenants from any increase for the first few years.

For a deeper look at how office CAM compares to other property types, see our guides on retail CAM and industrial CAM. For the specific audit procedures tenants use to review these charges, see our guide on commercial lease audit procedures.

Office CAM Leakage Benchmarks

When office operating expenses exceed market benchmarks without a clear driver, it's often a sign of one of several leakage patterns:

• Management fees above 5% of operating expenses
• Janitorial costs above $5.50/SF in non-union markets
• HVAC maintenance costs more than 40% above prior year without equipment replacement
• Insurance increases above 15% year-over-year without a claim event
• Capital expenditures passed through as maintenance without amortization

See our CAM leakage benchmarks by property type for a fuller breakdown of red flags across asset classes.

CapVeri's automated CAM reconciliation platform lets property managers run office reconciliations directly from Yardi or MRI exports, with gross-up calculations, exclusion tracking, and year-over-year variance flags built in. Start a free trial to see how your office CAM stacks up against these benchmarks.

Sources

1. J.P. Morgan - What Are CAM Charges in CRE?
2. BOMA International - BOMA Standards