Triple Net (NNN) Lease: CAM Reconciliation Guide for Landlords
Everything landlords need to know about CAM pass-throughs, gross-up applicability, and annual reconciliation requirements under a triple net lease.
Last updated: March 2026
Definition
A triple net (NNN) lease is a commercial lease structure where the tenant pays base rent plus their pro-rata share of all three operating expense categories: property taxes, property insurance, and maintenance/common area expenses — making the tenant responsible for virtually all building operating costs.
CAM Reconciliation at a Glance
| Attribute | Triple Net (NNN) Lease |
|---|---|
| CAM Included in Lease | Yes |
| Annual Reconciliation Required | Yes |
| Gross-Up Applicable | Yes — variable expenses |
| CAM Caps Applicable | Yes — by negotiation |
| Common Property Types | retail, industrial, suburban office, strip centers, big-box retail, flex space |
Who Bears Operating Expenses
Tenant bears all operating expenses: property taxes, property insurance, utilities, maintenance, janitorial, landscaping, management fees, and CAM charges. Landlord is responsible for structural repairs and capital improvements unless excluded by lease.
CAM Reconciliation Notes
NNN leases require full annual CAM reconciliation. The landlord collects monthly CAM estimates throughout the year and reconciles actual expenses against estimates in the first 90–120 days of the following year. Tenants have audit rights under most NNN leases, typically requiring written notice within 90–180 days of statement delivery.
Formulas
Tenant CAM Charge
Tenant CAM = Total CAM Pool × (Tenant RSF / Building Denominator RSF)
| Variable | Definition |
|---|---|
| Total CAM Pool | Sum of all recoverable operating expenses for the year, after exclusions |
| Tenant RSF | Tenant's rentable square footage as defined in the lease |
| Building Denominator RSF | Total leasable or rentable area used as the divisor — may exclude anchor tenants or vacant space per lease terms |
Gross-Up for Variable Expenses
Grossed-Up Variable Expense = Actual Variable Expense × (Gross-Up % / Actual Occupancy %)
| Variable | Definition |
|---|---|
| Actual Variable Expense | Variable operating expenses (utilities, janitorial, maintenance) at actual occupancy |
| Gross-Up % | Occupancy threshold specified in lease — typically 90%, 95%, or 100% |
| Actual Occupancy % | Occupied RSF / Total RSF at time of calculation |
Annual Reconciliation Settlement
Amount Due (or Credit) = Actual CAM Charge − Total Monthly Estimates Paid
| Variable | Definition |
|---|---|
| Actual CAM Charge | Tenant's final share based on actual expenses and reconciliation |
| Total Monthly Estimates Paid | Sum of monthly CAM estimate payments collected during the year |
Worked Example
A 50,000 SF retail center has three tenants. Tenant A leases 10,000 SF. Total actual CAM expenses for the year: $400,000. Building occupancy was 80% for most of the year. Gross-up threshold in Tenant A's lease: 95%. Variable expenses: $200,000; Fixed expenses (taxes + insurance): $200,000.
Step 1 — Gross up variable expenses: $200,000 × (95% / 80%) = $237,500.
Step 2 — Total grossed-up CAM pool: $237,500 + $200,000 = $437,500.
Step 3 — Tenant A's pro-rata share: 10,000 / 50,000 = 20%.
Step 4 — Tenant A's CAM charge: $437,500 × 20% = $87,500.
Step 5 — Tenant A paid $70,000 in monthly estimates → Balance due: $17,500.
Without gross-up, Tenant A would have been billed $80,000 — a $7,500 underrecovery for the landlord.
Landlord Risks Under This Lease Type
Failing to gross up variable expenses when occupancy drops below the lease threshold (typically 90–95%), leaving CAM underrecovered from remaining tenants
Applying caps to fixed expenses (property taxes, insurance) that should not be capped under most lease structures
Using the wrong pro-rata denominator — especially in multi-tenant retail centers where anchor exclusions reduce the billable area
Missing the reconciliation delivery deadline specified in the lease, which can waive the right to collect underpayments in some jurisdictions
Including capital expenditures in the CAM pool that are explicitly excluded by lease or statute
Common Reconciliation Mistakes
- Grossing up property taxes — taxes are fixed expenses and must not be grossed up regardless of occupancy
- Ignoring cumulative vs. non-cumulative cap distinctions, resulting in either over- or under-enforcement of expense limits
- Failing to update the pro-rata denominator when new tenants take occupancy or tenants expand
- Including management fees above the contractually permitted administrative fee percentage
- Sending reconciliation statements after the lease-specified deadline, creating collection risk
Frequently Asked Questions
Does a triple net lease require annual CAM reconciliation?
Yes. NNN leases require annual reconciliation of actual operating expenses against estimated payments collected during the year. The landlord must deliver a reconciliation statement — typically within 90 to 120 days after year-end — showing actual expenses, each tenant's pro-rata share, and any balance due or credit owed. The exact deadline is specified in the lease and varies by property type and market.
What expenses can be included in a NNN CAM pool?
Includable expenses under a standard NNN lease include property taxes, property insurance, utilities for common areas, landscaping and snow removal, parking lot maintenance and restriping, roof and building exterior maintenance (unless lease caps or excludes), janitorial services for common areas, security, property management fees (subject to lease-specified caps), and HVAC maintenance. Typically excluded: capital expenditures above a certain threshold, costs benefiting only one tenant, costs covered by insurance proceeds, and costs resulting from landlord's negligence.
Can a NNN lease have a CAM cap?
Yes. Many NNN leases include controllable expense caps — typically 3–5% annually — that limit how much the landlord can increase the controllable portion of CAM (janitorial, maintenance, management fees) year-over-year. Uncontrollable expenses (property taxes, insurance, utilities) are usually excluded from the cap. The cap may be cumulative (unused cap carries forward) or non-cumulative (forfeited each year). Non-cumulative caps are more favorable to the landlord.
How does gross-up work in a triple net lease?
A gross-up provision requires the landlord to adjust variable operating expenses as if the building were occupied at a specified threshold — typically 90, 95, or 100 percent. Only variable expenses (those that increase with occupancy, like janitorial, utilities, and maintenance) are grossed up. Fixed expenses like property taxes and insurance are never grossed up. The gross-up prevents remaining tenants from subsidizing vacant space when the building is less than fully occupied.
What audit rights do tenants have under a NNN lease?
Most NNN leases grant tenants the right to audit CAM reconciliation statements, typically requiring written notice within 90 to 180 days of statement delivery (the audit window varies by lease). The landlord must then make supporting records available within a specified period. Some leases specify that the reconciliation becomes final if no audit request is received within the window. Audit rights are limited to the current and immediately prior reconciliation year in most standard leases.
Free Calculators for This Lease Type
Related Resources
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