How do 80%/90% Coinsurance penalties and uncapped NNN insurance pass-throughs impact commercial tenants?

If a commercial building is insured for less than 80% or 90% of its true Replacement Cost under ISO CP 00 10, the insurer applies a proportional coinsurance haircut to partial claims—and under an uncapped Triple-Net (NNN) lease, landlords frequently pass through soaring property insurance premiums, 15% administrative fees, and roof/HVAC replacements directly to the tenant unless capped at 4% non-cumulative with an Agreed Value endorsement.

What is the difference between a cumulative and non-cumulative CAM & insurance cap?

A non-cumulative cap prevents the landlord from carrying forward unused cap percentages from prior years. Under a cumulative (or compounding) cap, if expenses only rose 2% in Years 1 and 2 under a 5% cap, the landlord can hit you with an 11% spike in Year 3.

Commercial Property Coinsurance & Lease PlaybookFree Commercial Property & Tenant Defense Tool

Commercial Lease NNN & Uncapped CAM 5-Year Exposure Calculator (Property Insurance & Coinsurance Defense)

Commercial property binders and Triple-Net (NNN) leases routinely expose policyholders and tenants to 80%/90% coinsurance claim penalties, uncapped insurance/CAM pass-throughs, a 15% administrative fee, and 100% of rooftop HVAC or roof replacements. Use the sliders below to calculate your 5-year exposure—then scan your policy binder or lease PDF below.

Enter Your Property Insurance & Lease NNN Details

Premises Size (Sq. Ft.)2,800 sq ft

Quoted Year-1 NNN / CAM Rate ($/sq ft/yr)$11.50 / sq ft

Lease Term (Years)5 Years

Uncapped Annual CAM Inflation11% / yr

Landlord Admin / Management Fee Markup15% (vs. 4% Cap)

Uncapped HVAC / Roof / Parking Pass-Through (Yr 3)$18,500

Uncapped Landlord NNN

$249,115

5-year cumulative NNN + capital pass-through

With 4% Redline Cap

$180,836

4% non-cumulative cap + capital exclusion

Total Overcharge Saved

+$68,279

Protected by 1 Redline Clause

Year-by-Year NNN / CAM Exposure Breakdown

Uncapped Lease4% Capped Redline

Year 1$37,030 vs. $33,488 (Save $3,542)

Year 2$41,103 vs. $34,828 (Save $6,275)

Year 3 Includes $18,500 HVAC/Roof Bill$64,125 vs. $36,167 (Save $27,958)

Year 4$50,643 vs. $37,507 (Save $13,136)

Year 5$56,214 vs. $38,846 (Save $17,368)

Copy-Paste 4% Non-Cumulative CAM Cap Redline Clause

Audit Your Full Lease PDF Below

“Tenant shall pay its Pro Rata Share of controllable Operating Expenses; provided, however, that (i) controllable Operating Expenses shall not increase by more than four percent (4%) per calendar year on a non-cumulative basis; (ii) Operating Expenses shall explicitly exclude capital expenditures, roof replacement, structural/foundation repairs, HVAC unit replacement, and executive salaries; (iii) administrative management fees shall not exceed four percent (4%) of Base Rent; and (iv) Tenant shall have the annual right to audit Landlord's CAM records.”

Does Your Property Binder or Lease Have an Uncapped Coinsurance / HVAC Loophole?

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EndorseIQ™ Policy & Binder Scanner

ACTIVE ENGINE: ENDORSEIQ™ (MULTI-HOP ISO & COVERAGE GRAPH)

1. Select Policy / COI Playbook & Protected RoleAuto-Tailored to Your Protected RoleCommercial Property & Lease COI • Protecting: Property Owners, Tenants & Landlords

2. Input Your Document (PDF, Word .docx, Scanned Image, or Text)

Upload PDF / Word (.docx)

Drop PDF / .DOCX anywhere, or press Cmd+V / Ctrl+V to paste policy, COI, or endorsement text

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COMMERCIAL PROPERTY, BOP & LEASE COI BINDER (POLICY NO. CBP-2026-8841)

THIS COMMERCIAL PROPERTY AND GENERAL LIABILITY BINDER ("Binder") is issued as of November 1, 2026, by IRONSHIELD SURPLUS LINES INSURANCE COMPANY ("Carrier") to SUMMIT RETAIL & WAREHOUSE HOLDINGS LLC ("Named Insured") for the commercial premises located at 450 Industrial Parkway (Building Limit: $2,400,000; Business Personal Property: $650,000; Lease Landlord: OAKRIDGE COMMERCIAL PROPERTIES LLC).

SECTION 4. COINSURANCE CONDITION (90%) AND ACTUAL CASH VALUE (ACV) ROOF SCHEDULE.
All Building and Business Personal Property coverage under Form CP 00 10 is subject to a strict ninety percent (90%) Coinsurance requirement without an Agreed Value Endorsement. If at the time of loss the full Replacement Cost Value of the Building exceeds the Limit of Insurance multiplied by 90%, Carrier shall penalize and reduce any partial loss payout proportionally. Furthermore, pursuant to Endorsement CP 10 36 (Roof Surfacing Valuation Limitation), any wind, hail, or storm damage to roof surfacing more than ten (10) years old shall be settled strictly on an Actual Cash Value (ACV) depreciated basis rather than Replacement Cost, subject to a separate five percent (5%) Named Storm / Wind-Hail percentage deductible ($120,000 deductible per occurrence).

SECTION 7. PROTECTIVE SAFEGUARDS ENDORSEMENT (ISO FORM CP 04 11 — SYMBOLS P-1 & P-9).
As a condition precedent to coverage under this Policy, Named Insured is required to maintain in complete working order at all times: (a) an Automatic Sprinkler System (Symbol P-1) under an active central station supervisory contract, and (b) an Ansul / UL-300 commercial hood suppression system and central burglar/fire alarm (Symbol P-9). If Named Insured fails to maintain such Protective Safeguards in active operational status or fails to notify Carrier within 24 hours of any impairment or inspection lapse, coverage for Fire, Smoke, and Water Damage under this Policy is AUTOMATICALLY SUSPENDED immediately prior to and during the loss.

SECTION 11. ORDINANCE OR LAW EXCLUSION (CP 00 10) AND WATER/SEWER BACKUP SUB-LIMIT.
This Policy excludes all loss, cost, or expense caused directly or indirectly by the enforcement of any local or state Ordinance or Law regulating the construction, ADA compliance, seismic/sprinkler retrofit, demolition, or repair of any building (Coverages A, B, and C under ISO CP 04 05 are NOT attached). Additionally, coverage for water or sewage that backs up or overflows from any municipal sewer, drain, or sump pump is strictly capped at a $10,000 aggregate sub-limit per policy period, and surface water or wind-driven rain entering through roof flashing is excluded unless the building first sustains an opening caused by direct wind force.

SECTION 16. BUSINESS INCOME 72-HOUR WAITING PERIOD AND 30-DAY EXTENDED PERIOD CAP.
Business Income and Extra Expense coverage (CP 00 30) shall not commence until seventy-two (72) full hours have elapsed following the direct physical loss ("Waiting Period Deductible"). Once physical repairs are completed and the premises are restored, Extended Business Income coverage for post-reopening revenue ramp-up shall terminate strictly thirty (30) days after the date the property is repaired, rather than the 180-day or 365-day Period of Restoration required under Named Insured's commercial lease.

SECTION 22. BLANKET ADDITIONAL INSURED PRIVITY RESTRICTION (CG 20 33) AND LEASE COI MISMATCH.
Additional Insured status for any Landlord, Property Manager, or Mortgagee is provided solely via Endorsement CG 20 33 (Additional Insured — Owners, Lessees or Contractors — Automatic Status When Required in Construction Agreement With You), which requires direct written contractual privity and excludes premises lease obligations (ISO Form CG 20 11 Managers or Lessors of Premises is NOT attached). Waiver of Transfer of Rights of Recovery Against Others to Us (CG 24 04) and Primary and Non-Contributory wording (CG 20 01) are omitted from this Binder.

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