What are typical CAM charges for office buildings?

Office CAM charges vary significantly by market tier, building class, and lease structure. In a modified-gross or NNN office lease, controllable operating expenses (janitorial, HVAC maintenance, common area utilities, security, landscaping, management fees) typically run $4–$8/SF/year for Class A suburban and $6–$12/SF/year for Class A urban — before taxes and insurance. In full-service gross buildings in major gateway markets (NYC, SF, Chicago), the full operating expense load absorbed by the landlord (and reflected in base rent or expense escalation) can reach $14–$22/SF when all cost categories are included. Real estate taxes add another $6–$18/SF in high-tax urban markets. The comparison is apples-to-oranges unless you know the lease structure: a $40/SF FSG lease and a $22/SF NNN lease can have identical total occupancy cost.

What's included in office building CAM charges?

Standard office CAM includes: janitorial and cleaning of common areas (lobbies, corridors, restrooms, elevators), HVAC maintenance for shared systems, common area utilities (lighting, elevator power), landscaping and exterior maintenance, security and building access systems, property management fees (typically 3–5% of operating expenses), building insurance, parking lot and structure maintenance, and repair and maintenance of shared mechanical and electrical systems. What's NOT included depends on the lease — well-negotiated office leases typically exclude capital expenditures, above-standard services to individual tenants, and executive landlord overhead.

How does gross-up work in office building CAM?

Office buildings — especially multi-tenant high-rises — almost universally apply gross-up to variable CAM expenses. When occupancy falls below a threshold (typically 95%), variable costs like janitorial, HVAC, and utilities are adjusted upward to reflect what they would have been at full occupancy. This prevents tenants from under-paying for services they'd need at full building population, and prevents landlords from absorbing costs that are demand-driven. The gross-up should only apply to truly variable expenses — fixed costs like insurance and certain management fees shouldn't be grossed up. Misapplied gross-up is a common audit finding in office buildings.

Can office tenants audit CAM charges?

Yes. Most office leases — especially those 5,000+ SF in institutional buildings — include an audit right allowing the tenant to review the landlord's CAM records within a specified window (typically 12–24 months after receiving the reconciliation statement). Tenants should exercise this right whenever a reconciliation seems high relative to comparable buildings or shows unusual year-over-year increases. Audit findings in office buildings commonly involve misallocated management fees, improperly grossed-up expenses, and capital expenditures passed through as maintenance.

What is a base year in an office lease, and how does it affect CAM?

A base year lease (also called a gross lease with expense escalation) means the landlord covers all operating expenses up to the base year amount, and the tenant pays only the excess above that threshold. If your base year (Year 1) operating expenses were $18.50/SF and current expenses are $21.75/SF, your pass-through obligation is $3.25/SF. The lower your base year expenses (e.g., a well-protested tax year or a low-cost construction year), the better positioned you are as a tenant. Conversely, if the landlord proposes a base year when costs were inflated, you'll be exposed to pass-throughs earlier. This is one of the most negotiated provisions in office lease economics.

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

By Angel Campa·Founder, CapVeriUpdated April 24, 2026

Quick Answer

Office operating expense pass-throughs typically range from $4–$12/SF/year for controllable CAM in modified-gross NNN leases, scaling to $14–$22/SF in full-service gross buildings in high-cost gateway markets where all expenses are embedded in the base rent. Most office leases use a base year or expense stop structure rather than pure NNN — which means tenants pay only the increase above a defined threshold, not the full CAM pool.

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.

Negotiation Leverage by Market Tier

Gateway urban Class A (NYC, SF, Boston, Chicago): Market is tight. Landlord leverage 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: Tenant leverage is better. 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 leverage. 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.