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A low base rent can look attractive until the first CAM reconciliation arrives. For commercial property owners and tenants, understanding what does CAM cover is essential because common area maintenance charges can materially affect a property’s operating income and a tenant’s true occupancy cost. The answer is never simply “maintenance.” CAM is defined by the lease, and the quality of that language determines what is recoverable, what is excluded, and where disputes may arise.

What does CAM cover?

CAM, or common area maintenance, generally covers the cost of operating, maintaining, repairing, and sometimes managing the shared areas of a commercial property. It is most common in retail centers, office buildings, industrial parks, and mixed-use properties where multiple tenants use the same entrances, parking areas, corridors, restrooms, landscaping, or building systems.

Rather than building every shared expense into base rent, many commercial leases require tenants to pay a proportionate share of these costs. That share is commonly based on the tenant’s rentable square footage divided by the total rentable square footage of the property. A tenant occupying 10% of a shopping center, for example, may be responsible for 10% of eligible CAM expenses.

The exact structure depends on the lease. In a triple-net lease, CAM charges may be one component of the tenant’s additional rent, alongside property taxes and insurance. In a gross or modified gross lease, some operating costs may be included in base rent, subject to expense stops, annual increases, or negotiated exclusions.

Typical costs included in CAM charges

A well-written CAM provision identifies the property areas and services covered, then explains how costs will be allocated. Common recoverable expenses often include routine services that keep shared areas safe, functional, clean, and presentable.

Maintenance of shared areas

This category can include parking lot sweeping, restriping, pavement patching, sidewalk repairs, pressure washing, trash removal, landscaping, irrigation, exterior lighting, security patrols, and janitorial service for common restrooms, lobbies, elevators, or hallways. At a retail center, it may also include cleaning storefront walkways, maintaining pylon signs, and keeping parking areas accessible.

For office properties, shared-area expenses may include lobby upkeep, elevator maintenance, HVAC service for common spaces, building engineer support, and cleaning of common corridors. Industrial properties may have fewer common amenities, but private roads, gates, drainage systems, lighting, and landscaping can still create ongoing CAM costs.

Utilities and service contracts

CAM may include utilities used in shared spaces, such as electricity for parking lot lights, water for landscaping, or gas and electricity serving a common lobby. Recurring contracts for pest control, fire alarm monitoring, elevator service, landscaping, security, waste collection, and window cleaning are also frequently recoverable.

The distinction matters. A tenant should not ordinarily be charged for utilities that serve another tenant’s exclusive premises, while an owner should have clear documentation supporting utilities that benefit the entire property.

Repairs and operating supplies

Ordinary repairs to common elements are often included, provided they restore rather than materially improve the property. Examples include repairing a damaged curb, replacing a failed exterior light fixture, fixing a gate motor, or patching a walkway.

Operating supplies may include cleaning products, trash receptacles, restroom supplies, signage maintenance materials, and other items used to operate common areas. These costs are generally modest individually but can add up across a multi-tenant building or shopping center.

Management and administrative costs

Many commercial leases permit a management fee within CAM. This fee compensates the owner or property manager for administering vendor contracts, overseeing maintenance, paying invoices, preparing budgets, coordinating repairs, and handling tenant communications related to shared operations.

Administrative charges are common, but they should be reasonable and clearly defined. Some leases state a fixed management fee or a percentage of total CAM expenses. Others limit administrative costs to a specific percentage, which gives tenants more predictability and helps prevent vague overhead charges from becoming a point of contention.

Costs that may be excluded or limited

The question is not only what CAM includes. It is also what the lease excludes. Careful exclusions protect tenants from being charged for costs that belong to ownership, while clear recovery language helps owners preserve the income needed to operate the property properly.

Capital expenditures are the most frequent area of negotiation. Replacing an entire roof, installing a new elevator, repaving a parking lot, or upgrading an HVAC system can provide a long-term benefit beyond routine maintenance. Tenants often seek to exclude these costs from CAM. Owners may seek recovery when a capital project reduces operating expenses, is legally required, improves safety, or replaces a failed building component.

When capital costs are recoverable, the lease should usually require amortization over the useful life of the improvement rather than charging tenants the full amount in one year. For example, a major energy-efficient lighting upgrade may be amortized over several years, potentially with recovery limited to the annual cost savings it produces.

Other common exclusions include leasing commissions, tenant improvement costs, costs caused by another tenant’s negligence, debt service, income taxes, penalties resulting from the owner’s actions, legal fees unrelated to property operations, and costs covered by insurance proceeds. Marketing expenses and costs associated with vacant space may also require specific treatment.

Why gross-up provisions matter

A property that is partly vacant still needs lighting, cleaning, security, and maintenance. If CAM is calculated only on the actual expenses incurred during a low-occupancy period, the occupied tenants may pay less than they would when the property is fully leased. That can create an imbalance for the owner once operations normalize.

A gross-up provision addresses this issue by allowing variable operating expenses to be adjusted as though the building were occupied at a stated level, often 95% or 100%. It is most common in office properties, where utility and janitorial costs can change substantially with occupancy.

Gross-up clauses need precision. Fixed costs such as property management fees, insurance, or certain service contracts may not require adjustment. Variable costs should be identified, and the method should be consistent from year to year. Without a clear formula, a provision intended to create fairness can instead create confusion.

CAM caps and controllable expenses

Tenants often negotiate annual caps on controllable CAM expenses. A cap may limit annual increases to a set percentage, such as 5% or 8%, often on a cumulative or non-cumulative basis. These provisions help tenants forecast occupancy costs, particularly in retail and office leasing where margins can be sensitive to unexpected expense increases.

Not every expense is usually subject to the cap. Property taxes, insurance premiums, utilities, snow removal where applicable, and costs driven by government requirements are often treated as uncontrollable. The specific definition of controllable expenses should be stated in the lease. Otherwise, a cap that appears valuable may apply to only a narrow portion of total charges.

From an owner’s perspective, a cap should not prevent necessary maintenance or force the property below market standards. Deferred repairs, inadequate cleaning, and neglected parking areas can damage tenant retention, curb appeal, and long-term asset value. The better approach is accurate budgeting, transparent communication, and lease language that separates routine cost increases from exceptional events.

How CAM is billed and reconciled

Commercial tenants commonly pay estimated CAM charges monthly with their base rent. The owner prepares an annual budget, estimates each tenant’s share, and collects the amount in installments throughout the year. After year-end, actual expenses are calculated and compared with estimates.

If a tenant paid too little, the owner issues a reconciliation invoice. If the tenant overpaid, the owner may provide a credit or refund, depending on the lease. Strong financial controls matter at every stage: invoices should be retained, expense categories should match the lease, and annual statements should be understandable enough for an owner or tenant to review without guesswork.

Many leases provide tenants with audit rights, usually within a limited period after receiving the reconciliation. Those rights should be managed professionally. A complete paper trail, consistent accounting categories, and a documented allocation method reduce the likelihood that an audit becomes a prolonged dispute.

What owners should address before signing a lease

For Los Angeles commercial owners, CAM language should align with the property’s actual operating model. A retail property with extensive parking, landscaping, signage, and security needs should not use the same generic provision as a small industrial building with limited common areas.

Before finalizing a lease, owners should confirm how expenses are allocated, which costs are recoverable, whether a management fee is allowed, how vacancies are handled, and whether capital expenditures can be amortized. They should also make sure vendor agreements, maintenance schedules, and accounting practices can support the charges described in the lease.

Tenants should review the same details before committing. Requesting prior CAM budgets and reconciliations can reveal whether the estimates are realistic. A tenant should understand its proportionate share, any cap, the definition of gross-up, capital expense rules, and the timeline for reconciliation. Base rent is only part of the financial picture.

A clear CAM structure does more than allocate bills. It gives owners the resources to maintain a property correctly and gives tenants confidence that their charges are tied to real, documented property operations. That clarity is the foundation for a healthier commercial relationship and a better-performing asset over time.