What's the difference between the CAM pool and total property expenses?

The CAM pool is the subset of total property operating expenses that the lease permits the landlord to recover from tenants. Total property expenses include items tenants never pay — depreciation, capital expenditures, executive compensation above the management fee cap, income taxes, and leasing commissions. A property with $2M in total annual expenses might have a recoverable CAM pool of $1.4M after removing these categories. The pool size depends entirely on each lease's inclusion/exclusion list.

How do I map GL accounts to CAM categories without a chart of accounts guide?

Start with the account name and vendor. Janitorial vendor invoices booked to a 'Building Maintenance' GL code are almost certainly includable. Capital vendor invoices (roofing contractors, HVAC replacement specialists) booked to the same code need to be split. Build a mapping table with four columns: GL account number, GL account name, CAM includable (yes/no/partial), and the lease clause that controls it. For partial accounts (like a GL code that mixes routine maintenance and capital repairs), you'll need to review the underlying transactions.

When should I gross up expenses, and which expense types qualify?

Gross-up applies when the property is below the occupancy threshold specified in the lease — typically 90% or 95%. Only variable expenses (those that scale with occupancy) qualify. Fixed expenses like a parking lot management contract with a flat monthly fee don't change with occupancy, so grossing them up overstates the pool. Variable expenses that do qualify: janitorial labor tied to occupied square footage, common area utilities that increase with building population, and landscaping contracts with per-building-visit pricing. Always check the lease for the specific threshold and the definition of 'variable expenses.'

How do base-year caps interact with the gross-up calculation?

The sequencing matters and the lease should specify it. If the lease says 'gross-up applies to expenses subject to the cap,' then gross up first, test the grossed-up total against the cap, and apply the cap if exceeded. If the lease is silent, most attorneys advise applying the cap to actual (un-grossed) expenses to avoid double-favoring the landlord. Document your sequencing choice in the reconciliation workbook — if a tenant disputes it, you need to show you followed either the lease language or a conservative interpretation.

What's the fastest way to find denominator errors in an existing reconciliation?

Pull the denominator used in each tenant's statement and compare it against the GLA schedule. Also run a sense-check: sum all tenant pro-rata shares. If they total more than 100%, you have a denominator error. If they total significantly less than 100%, you either have excluded anchor space or a data entry mistake. Also check any partial-year tenants — their fractional shares should still be based on the same full-year denominator, just multiplied by their occupancy fraction.

CAM Expense Reconciliation Process: GL Mapping to Final Billing

By Angel Campa·Founder, CapVeriUpdated April 24, 2026

Quick Answer

The CAM expense reconciliation process has five phases: GL mapping and exclusions, controllable/non-controllable split, gross-up calculation (if occupancy is below threshold), cap math, and pro-rata share billing. Getting the GL mapping right is the foundation — errors there compound through every downstream calculation.

Why the Process Order Matters

CAM expense reconciliation isn't a single calculation — it's a sequence of decisions, each dependent on the one before. A property accountant who gross-ups before removing non-recoverable expenses will overstate the pool. One who applies the cap before the gross-up may create a calculation the lease doesn't support.

This guide walks through the process in the correct order, with worked dollar examples at each stage.

If you need a step-by-step task list, use the CAM reconciliation checklist alongside this guide.

Phase 1: GL Account Mapping

Building the Account Map

Every CAM reconciliation starts with a complete GL export for the property year. Your first job is assigning every GL account a disposition: includable, excludable, or partial.

A standard mapping table looks like this:

GL Account	Account Name	Disposition	Lease Clause
5100	Janitorial Services	Include	§7.1(a)
5200	Landscaping	Include	§7.1(b)
5300	Building Maintenance	Partial	§7.1(c), §7.3
5400	Management Fee	Include (capped)	§7.2 — max 3% opex
5500	Capital Improvements	Exclude	§7.4
5600	Depreciation	Exclude	§7.4
5700	Real Estate Taxes	Include (non-controllable)	§8.1
5800	Insurance	Include (non-controllable)	§8.2

The "Partial" accounts require transaction-level review. Account 5300 (Building Maintenance) might contain both a $4,200 quarterly HVAC service contract (includable) and a $45,000 HVAC compressor replacement (excludable). Pull the underlying transactions and split them.

For a full inclusion/exclusion breakdown, see what is included in CAM expenses.

Management Fee Cap

Management fees are nearly always includable but frequently capped. Common cap structures:

3% of total operating expenses (most common in retail)
4% of gross revenues
A fixed dollar amount per square foot

Example: 200,000 SF property, $1,800,000 in total operating expenses. Management fee cap at 3% of opex = $54,000. If actual management fees billed = $72,000, the excess $18,000 is excluded from the pool.

Phase 2: Controllable vs. Non-Controllable Split

Once you have a clean includable expense pool, split it into controllable and non-controllable categories. This split drives the cap calculation — caps only apply to controllable expenses in most leases.

Controllable expenses (typically): janitorial, landscaping, parking lot maintenance, security, common area utilities, management fees, general repairs.

Non-controllable expenses (typically): real estate taxes, property insurance, snow and ice removal (in some leases), utility costs for uncontrollable municipal rate changes.

See controllable vs non-controllable expenses for how different lease types classify each category.

Example Split

Property: 350,000 SF retail center Year-end includable expenses: $2,100,000

Category	Amount	Classification
Janitorial	$280,000	Controllable
Landscaping	$140,000	Controllable
Parking lot maintenance	$95,000	Controllable
Security	$210,000	Controllable
Common area utilities	$175,000	Controllable
Management fee	$54,000	Controllable
Repairs and maintenance	$146,000	Controllable
Real estate taxes	$700,000	Non-controllable
Insurance	$300,000	Non-controllable
Total	$2,100,000

Controllable subtotal: $1,100,000 Non-controllable subtotal: $1,000,000

Phase 3: Gross-Up Calculation

When Gross-Up Applies

The lease will specify an occupancy threshold — typically 90% or 95%. If actual average occupancy for the year falls below that threshold, variable CAM expenses get grossed up to what they would have been at the threshold occupancy.

Why this matters: if a building is 70% occupied, the landlord is covering more common area maintenance per occupied tenant than they would at full occupancy. Without gross-up, tenants benefit from a windfall reduction. The gross-up clause restores the per-tenant cost to a stabilized-occupancy level.

The Math

Formula: Grossed-up expense = (Actual variable expense ÷ Actual occupancy %) × Gross-up threshold %

Continuing the example above:

Property: 350,000 SF, 245,000 SF occupied = 70% occupancy
Gross-up threshold per lease: 95%
Variable controllable expenses: $1,100,000

But wait — not all controllable expenses are variable. The $54,000 management fee contract is a flat fee regardless of occupancy. The $146,000 in repairs is mostly reactive (same vacancy percentage doesn't reduce repair calls much). A reasonable variable/fixed split:

Expense	Total	Variable Portion
Janitorial	$280,000	85% = $238,000
Landscaping	$140,000	30% = $42,000
Parking lot maintenance	$95,000	20% = $19,000
Security	$210,000	40% = $84,000
Common area utilities	$175,000	70% = $122,500
Management fee	$54,000	0% = $0
Repairs and maintenance	$146,000	25% = $36,500

Total variable portion: $542,000

Gross-up: ($542,000 ÷ 0.70) × 0.95 = $735,143

Fixed portion: $558,000 (unchanged)

Grossed-up controllable CAM: $735,143 + $558,000 = $1,293,143

For a deeper walkthrough of gross-up with multiple scenarios, see the CAM gross-up calculation guide.

Phase 4: Cap Calculation

Applying the Cap

With the grossed-up pool in hand, test the controllable portion against the lease's cap. Assume the cap is 5% per year and prior-year controllable CAM was $1,050,000.

Maximum allowed increase: $1,050,000 × 1.05 = $1,102,500

Grossed-up controllable CAM: $1,293,143

Cap applies. Capped controllable CAM: $1,102,500

Final billable pool: $1,102,500 (controllable, capped) + $1,000,000 (non-controllable) = $2,102,500

Note: without the gross-up, this property's actual controllable expenses ($1,100,000) would have been just under the cap. The gross-up created the cap-triggering situation — which is why documenting the sequencing matters.

For more on cap structures, see CAM cap types.

Phase 5: Pro-Rata Share Billing

Computing Each Tenant's Share

Pro-rata share = tenant's rentable SF ÷ denominator

Denominator is typically total leasable area, but leases vary. Retail leases often exclude anchor tenant space. Some office leases use rentable area on a floor-by-floor basis.

For the pro-rata share calculation in detail, see that resource. For this example:

Property GLA: 350,000 SF Anchor tenant (excluded from denominator per lease): 80,000 SF Effective denominator: 270,000 SF

Tenant	SF	Pro-Rata Share	CAM Charge
Tenant A	15,000	5.56%	$116,899
Tenant B	8,500	3.15%	$66,229
Tenant C	22,000	8.15%	$171,354
Anchor	80,000	Excluded	$0 (or flat fee)
(remaining tenants...)	144,500	53.52%	—
Vacant	80,000	—	Not billed

Reconciling Against Estimates

Each tenant paid monthly estimates during the year. The final reconciliation computes:

Final charge − Total estimates paid = True-up amount

Positive true-up: tenant owes additional payment Negative true-up: landlord issues credit against next month's rent

For the mechanics of handling credits and disputes, see CAM true-up.

Building the Audit Trail

Every calculation step should be documented with the source data attached:

GL export with account mapping notations
Management fee cap calculation
Controllable/non-controllable split schedule
Variable/fixed expense split for gross-up
Gross-up calculation worksheet
Cap calculation worksheet (with prior-year comparison)
Pro-rata share denominator source (rent roll)
Tenant billing summary with estimate reconciliation

This documentation package is what you hand over if a tenant exercises their audit rights. See defensible reconciliation package for what "audit-ready" looks like.

Where CapVeri Fits

CapVeri automates Phases 1–5 after you import your GL export. The account mapping table is configured once per property and reused each year. Gross-up and cap parameters are set per lease. Pro-rata share denominators pull from your rent roll import.

The platform produces the audit trail documentation as a byproduct of the calculation — not a separate manual step.

Use the CAM reconciliation checklist alongside CapVeri to make sure no pre-import steps (like lease abstract review) get skipped.