CAM Charges and Your Pro-Rata Share

Why this matters

The base rent on a shop lease is a number you negotiated and can plan around. Common area maintenance charges are a number the landlord computes, bills monthly on an estimate, and then reconciles once a year with a statement that often arrives months after the year ended. That statement is where shops get surprised: a true-up bill for a share of a parking lot repave, a management fee, or a vacant unit's costs, due in one payment. The math behind it is simple arithmetic on square feet and a list of expenses, and the lease decides both. A shop that knows how to read the reconciliation catches errors that are common and, in many leases, recoverable.

The other lease clauses are on Commercial Lease Clauses a Trade Shop Should Read First. This card is CAM alone.

Gross, modified gross and triple net in plain words

The three common structures differ in who carries the building's operating costs:

• Gross lease. One rent figure; the landlord pays the building's taxes, insurance and maintenance out of it. Simple to budget. The landlord prices the risk of cost increases into the rent.
• Modified gross. Rent covers the operating costs of a base year (usually the first year of the lease), and the tenant pays its share of increases above that base. Another version uses an expense stop, a fixed level above which the tenant pays its share. Early in the lease you pay little; later the increases accumulate.
• Triple net (NNN). The tenant pays base rent plus its share of the three "nets": property taxes, property insurance, and common area maintenance. Taxes and insurance are sometimes billed on the same statement as CAM and sometimes separately.

Industrial and flex buildings, which is where most trade shops end up, are very often triple net. Many shops sign one thinking of the base rent as the rent.

What a pro-rata share is

Pro-rata share is your fraction of the building's shared costs, usually computed as your premises' area divided by the building's area. A 6,400 square foot unit in a 32,000 square foot building is a 20 percent share (6,400 / 32,000 = 0.20).

The denominator is where the arithmetic most often goes wrong, and the lease controls it. The common definitions:

• Rentable area of the building, whether leased or not. The landlord carries the share of vacant space. This is the usual tenant-friendly definition.
• Leased or occupied area. Your share grows when another unit is empty, so you pay for your neighbor's vacancy.
• A fixed percentage stated in the lease. Simple, and worth checking against the actual areas at signing.

Some leases also contain a gross-up clause, which adjusts expenses that vary with occupancy (janitorial in common areas, some utilities, a management fee charged on collections) to what they would have been if the building were mostly full. Applied to variable costs only, gross-up is legitimate and keeps the base year honest in a modified gross lease. Applied to fixed costs like insurance or snow removal, it is an overcharge.

What landlords commonly pass through, and what leases exclude

Typical CAM items for a small industrial building: landscaping and grounds, snow and ice removal, parking lot sweeping, striping and minor repair, site lighting and any common utilities, common area repairs, roof repairs (on some leases), property insurance, and a property management fee. Property taxes may ride along or come separately.

A well-negotiated lease lists exclusions, and the common ones are:

• Capital improvements and replacements, such as a full parking lot repave or a roof replacement, either excluded entirely or allowed only when amortized over their useful life;
• costs of leasing other space: commissions, legal fees, tenant improvements for other tenants;
• the landlord's financing, debt service and ground rent;
• costs to correct code violations or construction defects that existed before the lease;
• costs caused by another tenant, or reimbursed by insurance or warranties;
• management fees above a stated cap, often a percentage of the other operating expenses.

If your lease has no exclusions list, the landlord's form definition of operating expenses governs, and it is usually broad. That is a reason to negotiate the list before signing, along with a cap on controllable CAM, a limit on how fast the expenses the landlord controls (not taxes, insurance, snow or utilities) may rise each year.

A worked reconciliation, audited

A shop leases 6,400 square feet in a four-unit building of 32,000 rentable square feet. The lease says: pro-rata share is the premises' rentable area divided by the building's rentable area; capital items are allowed only if amortized over their useful life; the management fee may not exceed 4 percent of the other operating expenses; leasing costs are excluded. One 6,400 square foot unit sat vacant all year, so 25,600 square feet were leased.

The landlord's statement, with every expense line shown as a share of the landlord's billed pool (so the billed pool totals 100), and the tenant's audited version beside it:

CAM RECONCILIATION, ONE CALENDAR YEAR
Units: share of landlord's billed pool (=100)
LINE                    BILLED  AUDITED  NOTE
Landscaping, grounds      9.0     9.0
Snow and ice             14.0    14.0
Lot sweep, striping       5.0     5.0
Lot repave (full)        24.0     1.6   capital /15 yr
Site lighting power       6.0     6.0
Property insurance       16.0    16.0
Roof repairs             10.0    10.0
Management fee            8.0     2.5   cap 4% of rest
Leasing legal fees        8.0     0.0   excluded
POOL                    100.0    64.1
Area / denominator   6,400/25,600  6,400/32,000
Pro-rata share           25.0%   20.0%
Tenant share of pool     25.0    12.8
Less estimates paid      16.0    16.0
Balance due (credit)      9.0    (3.2)

Line by line, what the audit did:

1. Denominator. The landlord divided by leased area, 25,600 square feet, giving 6,400 / 25,600 = 25 percent. The lease says rentable area, 32,000 square feet, giving 20 percent. On its own, that inflated the shop's share by a quarter (25 / 20 = 1.25).
2. Lot repave. A full repave is a capital replacement, not maintenance. Under this lease it may come through only amortized; at a 15-year life that is 24.0 / 15 = 1.6 of this year's pool. (Sweeping and striping, the 5.0 line, stays: that is ordinary maintenance.)
3. Leasing legal fees. The 8.0 for lease work on the vacant unit is on the exclusions list. Out entirely.
4. Management fee. The cap is 4 percent of the other operating expenses. After the first three corrections, those total 9.0 + 14.0 + 5.0 + 1.6 + 6.0 + 16.0 + 10.0 = 61.6, and 4 percent of 61.6 is 2.46, shown rounded as 2.5. The billed 8.0 was charged on the uncorrected pool and at a higher rate.

The corrected pool is 64.1 of the original 100. The shop's 20 percent share is 12.8. It already paid 16.0 in monthly estimates during the year, so instead of owing the 9.0 on the landlord's statement, it is owed a credit of 3.2 (16.0 minus 12.8). The audit moved the shop's figure from 25.0 to 12.8, roughly half.

Every correction came from a sentence in the lease. Without the exclusions list, the capital-amortization rule and the fee cap, the audit would have fixed only the denominator: 20 percent of the full 100 is 20.0, so the shop would still owe 4.0 (20.0 minus 16.0).

Audit rights and the annual reconciliation

The estimates you pay monthly are the landlord's projection, usually based on last year's costs. After the year ends, the landlord totals the actual costs and sends a reconciliation statement showing your share, what you paid, and the difference. Leases commonly require delivery within some months of year end; some say nothing, and statements can arrive late enough to cover two years at once.

Audit rights let the tenant inspect the landlord's books for the year being reconciled. They are only as good as their terms, so read:

• The window. Many leases give the tenant a fixed period after receiving the statement, often 90 to 180 days, to object or request an audit. Miss it and the statement is commonly deemed final.
• Pay first or not. Many leases require paying the billed amount while the audit runs, with a refund if it finds an overcharge.
• Who pays for the audit. Commonly the tenant, unless the overcharge exceeds a stated threshold (3 to 5 percent is a frequent figure), in which case the landlord reimburses it.
• Who may audit. Some leases bar auditors paid on a contingency fee, or require a certified public accountant.

If the lease has no audit right at all, ask for one before signing. Without it you can still ask for the backup, and many landlords will provide invoices, but you have no contractual right to them.

Budget for the surprise

Even with a correct reconciliation, the true-up bill arrives as one payment for a full year's difference. A shop that pays estimates set from a quiet year and then gets a snowy one owes the difference at once. Set aside a reserve for it, sized as a share of the year's estimates, and adjust it after the first statement you see. When estimates come in well below the prior year's actual costs, ask why.

This is not legal advice. How a lease's operating-expense definition applies to a disputed line is a question for a commercial real estate attorney, and the audit window keeps running while you decide.

References

• Your lease: operating expense definition, exclusions, pro-rata share definition, gross-up clause, and audit provision
• See related: Commercial Lease Clauses a Trade Shop Should Read First
• See related: Who Pays When the Rooftop Unit Dies Under a Lease
• See related: Lease vs Buy Your Shop Location Decision Tree