What are CAM charges in a commercial lease?

CAM charges — common-area maintenance — are the tenant's share of a building's operating expenses (cleaning, repairs, landscaping, security, utilities for common areas, insurance, management) recovered on top of base rent. The shape varies: base-year, gross, modified-gross, or triple-net; pro-rata share denominated in rentable square feet; inclusions, exclusions, caps, and a reconciliation window with audit rights. Holdmark extracts the CAM clauses from the uploaded lease PDF and binds every value to the page and section that produced it, so the audit trail reads as a verification step rather than a guess.

The tenant's share of the building's operating expenses — recovered on top of base rent.

CAM is not rent (rent is the right to occupy the premises; CAM pays for the building the premises sits inside) and not a property-tax pass-through (which is usually a separate line billed alongside CAM). It is a recurring reimbursement for the operating expenses the landlord incurs to keep the building usable — defined in the operating-expenses clause, calculated against the pro-rata share, and reconciled each year against a certified actual.

The clause usually reads as a single percentage of pro-rata share, but the number that matters is the one buried in the definition: inclusion list, exclusion list, cap figure, base year, and reconciliation window. Where the language reads ambiguously, a structured abstract surfaces the field as ambiguous rather than resolving it silently — the audit trail is the deliverable.

Base year, pro-rata share, inclusions, exclusions, reconciliation, and caps — each with its own failure mode.

Base year vs. gross

Whether the tenant pays its share of increases or its share of everything.

A base-year / fixed-stop lease names a calendar year as the landlord's expense floor: the tenant only pays its pro-rata share of CAM that exceeds that floor. A gross / full-service lease folds CAM into a stated base-rent rate, sometimes with a base-year stop layered on top. A net / modified-gross / triple-net (NNN) lease treats the tenant as paying its pro-rata share of all operating expenses with little or no exclusion.

Flag: Confirm the lease type, whether a base-year stop is layered on top of a gross or net shape, and the clause that pins the base-year number (sometimes explicitly, sometimes as a defined term that must be looked up).

Pro-rata share

The fraction of the building's expenses that lands on this tenant.

Pro-rata share is the tenant's rentable square feet divided by the building's total rentable square feet, and the figure that matters is the one explicitly named in the lease — not the figure on the floor plan. The same share is re-tested at expansion or contraction, so a tenant that takes additional space mid-term pays its share against the new combined figure, not the original one.

Flag: Confirm the rentable figure the share divides against (rentable, not usable), whether the denominator is the whole building or a sub-set (a floor, a wing), and what happens at expansion or contraction.

Inclusions and exclusions

What is billed and what is not — and which lines surprise tenants most.

Common CAM inclusions are cleaning, repairs, landscaping, security, utilities for common areas, insurance, and management / admin fees. Common exclusions are capital expenditures, leasing commissions, tenant-specific utilities, costs attributable to other tenants' build-outs, and ground-floor retail signage. Management fees and leasing commissions are the two most litigated lines: many leases exclude them but pass them through by default in the absence of a clear opt-out.

Flag: Confirm whether management fees, leasing commissions, and admin overhead are passed through, and whether capital expenditures and build-out costs for other tenants are carved out.

Reconciliation and audit

The annual true-up — and the audit rights that make it verifiable.

Each year the landlord delivers a certified operating-expense statement comparing estimated expenses to actuals, and the tenant owes (or is credited) the difference. Most leases give the tenant a window to audit — commonly 30–90 days after delivery, sometimes 6–12 months — through an independent accountant, with access to the underlying invoices. A landlord's failure to deliver the statement on time often converts into a deemed-acceptable set of expenses, which is the tenant's last-resort remedy.

Flag: Confirm the reconciliation window, the audit window, whether the tenant bears the auditor's cost, the auditor standards (independent CPA, not employee), and the consequence of a successful challenge (refund, credit, or interest).

Expense caps

A ceiling on the year-over-year increase tenants will pay.

A controllable-expense cap (commonly 3–5%/yr) bounds what the tenant will pay for categories the landlord controls day-to-day — management, janitorial, landscaping — but usually leaves utilities and insurance uncapped because they swing with external markets. A gross-expense cap exists in some retail leases and bounds all categories. Carve-outs let the cap be bypassed for specific events: property-tax appeals, snow events, utility pass-throughs, and force-majeure costs.

Flag: Confirm whether the cap is controllable or gross, the figure, the base year for the cap, and the carve-outs the cap does not bind.

Holdmark surface

Every CAM value in the abstract is bound to the page and clause that produced it.

When a lease PDF is uploaded, Holdmark extracts the CAM clauses the same way it extracts rent escalations and renewal options: the rate (or base-year and pro-rata share in a base-year shape), the inclusion / exclusion list, the cap figure and carve-outs, the reconciliation window, and the audit window. Each value lands as a string field in the abstract with the page number and section reference that produced it — auditors verify in one click rather than re-reading the PDF.

Flag: Audit trail in the abstract is the deliverable: a value without a page reference does not surface as bound to the source.

Four checks worth running before the operating-expenses clause is signed.

Inclusion list, exclusion list, and what management fees look like.

Negotiate the inclusion list (cleaning, landscaping, security, utilities for common areas, insurance, admin) alongside the exclusion list (capital expenditures, leasing commissions, tenant-specific utilities, build-out costs for other tenants, ground-floor retail signage). Confirm whether management fees and admin overhead are passed through or carved out — this is the line most often quietly passed through by default.

Pro-rata share definition and what happens at expansion or contraction.

Pin the rentable square footage the share divides against, the denominator (whole building vs. a sub-set), and the moment the share is re-tested. A tenant that takes additional space mid-term wants the new combined figure used going forward; a tenant that gives back space wants its share reduced for the remainder. Confirm both directions end-to-end before signing.

Audit rights — window, cost-bearing, standards, and the consequence of a challenge.

Confirm the audit window (30–90 days after delivery is common; 6–12 months is the upper end), whether the tenant bears the auditor's cost, the auditor standards (independent CPA, not an employee), and the remedy on a successful challenge (refund, credit, or interest). Many leases convert a landlord's failure to deliver on time into a deemed-acceptable set of expenses — confirm the deemed-acceptable clause end-to-end.

Cap figure, controllable vs. gross, and the carve-outs the cap does not bind.

A controllable-expense cap (commonly 3–5%/yr) bounds management and janitorial but leaves utilities and insurance uncapped; a gross-expense cap bounds all categories but exists mostly in retail leases. Push for a controllable cap, confirm the base year for the cap, and negotiate the carve-out list narrow — passing through property-tax appeals, snow events, utility pass-throughs, and force-majeure costs without bound is the landlord's usual ask.

Each value is bound to the page and section reference in the source lease — auditors verify it in one click. The per-lease schedule lives in alert preferences; plans and integrations live on the pricing page.

When you're ready to send the first PDF.

The early-access cohort opens through the intake page, or send an anonymised lease and Holdmark will return the records side by side. Holdmark surfaces CAM terms as an explicit field in the extracted abstract — the rate (or base year and pro-rata share in a base-year shape), the inclusion / exclusion list, the cap figure and carve-outs, the reconciliation window, and the audit window — bound to the page and section reference in the source PDF, so the audit trail reads as a verification step rather than a guess. For a sense of how the structured record reads end-to-end, the pricing page includes a sample extraction from a 30-page office lease.