2.5 Common Property Policy Conditions and Clauses

Key Takeaways

  • Conditions govern duties and rights; ISO commercial conditions live in CP 00 90 and the Common Policy Conditions IL 00 17.
  • The mortgagee clause lets a lender collect and get separate cancellation notice even when the insured's coverage is voided.
  • Vacancy beyond 60 days suspends vandalism/glass/water/theft/sprinkler coverage and cuts other losses 15%.
  • Other-insurance methods (pro rata, equal shares, excess) coordinate coverage so total recovery never exceeds the loss.
Last updated: June 2026

Conditions: the Rules of the Contract

Conditions are the provisions that spell out the duties and rights of each party. They are not coverage grants; they govern how coverage operates. On the ISO Commercial Property program, most are found in the Commercial Property Conditions (CP 00 90) and the Common Policy Conditions (IL 00 17), which apply across the whole policy.

Key insured duties after a loss: give prompt notice, protect the property from further damage (mitigation), provide a proof of loss (typically within 60 days when requested), cooperate, submit to examination under oath, and not abandon property. Failure to meet a post-loss duty can reduce or void the claim — a favorite exam consequence.

Clauses That Get Tested

ClauseWhat it does
Insurable interestInsured must stand to suffer financial loss — required at the time of loss in property
Mortgage (mortgagee) clauseProtects the lender; the mortgagee can collect even if the insured's act voids the insured's own coverage, and gets separate notice of cancellation
Loss payable clauseNames a lienholder to be paid, but without the mortgagee's independent rights
Vacancy provisionAfter 60 consecutive days vacant, coverage for vandalism, glass, water, theft, and sprinkler leakage is suspended, and other losses are cut by 15%
LiberalizationBroadened coverage adopted by the insurer mid-term applies automatically at no charge
SubrogationAfter paying, the insurer assumes the insured's right to recover from a responsible third party
AppraisalEither party may demand appraisal to settle a value/amount dispute (not a coverage dispute)

Cancellation, Nonrenewal, and Other Insurance

Cancellation rules limit insurer power. Under the Common Policy Conditions, the insurer must give 10 days notice for nonpayment and typically 30 days for other reasons; the insured may cancel anytime. New policies often have a 60-day underwriting window during which the insurer may cancel for nearly any lawful reason; after that, statutory reasons narrow.

Other-insurance provisions resolve overlapping coverage:

  • Pro rata — each insurer pays its share of the limit (its limit / total limits x loss).
  • Contribution by equal shares — insurers pay equally until one limit exhausts, then the rest continue.
  • Excess — one policy pays only after the primary is exhausted.

Worked pro rata example. Policy A limit $200,000, Policy B limit $300,000, total $500,000. A covered $100,000 loss splits: A pays (200/500) x 100,000 = $40,000; B pays (300/500) x 100,000 = $60,000. Trap: the insured never collects more than the loss — the principle of indemnity caps total recovery, and the policies coordinate so there is no profit from double coverage.

Test Your Knowledge

A commercial building stands completely vacant for 75 consecutive days, then suffers a vandalism loss. How does the standard vacancy provision affect the claim?

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Test Your Knowledge

Two policies cover the same building on a pro rata basis: Policy A's limit is $150,000 and Policy B's limit is $350,000. A covered loss of $80,000 occurs. How much does Policy A pay?

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B
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D

Conditions Are Enforceable Duties, Not Boilerplate

Conditions set out the duties both parties must perform for the coverage promise to function, and breach of a material condition can defeat an otherwise valid claim. The insured's principal post-loss duties are to give prompt notice, protect the property from further damage (mitigate), prepare an inventory, cooperate with investigation, submit a signed sworn proof of loss within the stated period, and submit to examination under oath if requested. The exam tests these by describing an insured who delayed notice, threw away damaged property before inspection, or refused to cooperate, then asks the coverage consequence.

Appraisal: The Dispute Mechanism for Amount, Not Coverage

When the insurer and insured agree that a loss is covered but disagree on the dollar amount, the appraisal condition provides a binding valuation process: each party selects a competent, impartial appraiser, the two appraisers select an umpire, and agreement by any two of the three sets the amount. Appraisal resolves value disputes only; it does not decide whether the loss is covered. A common exam trap offers appraisal as the remedy for a coverage denial, which is wrong, because coverage questions go to the courts, not to appraisal.

Subrogation, Salvage, and the Mortgagee Clause

The subrogation condition transfers the insured's right to recover from a negligent third party to the insurer after payment, and the insured must not impair that right (for example, by signing a pre-loss waiver of recovery against a contractor). Salvage lets the insurer take and sell damaged property it has paid for. The standard (union) mortgage clause protects the lender's interest separately from the owner's, so the mortgagee can collect even if the owner's own act (such as arson) voids the owner's coverage, provided the mortgagee pays premium on demand and notifies the insurer of known hazards.

Cancellation, Nonrenewal, and Assignment

Cancellation ends coverage mid-term; insurers are limited to stated reasons (nonpayment, material misrepresentation, substantial increase in hazard) and must give advance written notice, with a longer notice period the further into the term the policy has run. Nonrenewal declines to continue at expiration and also requires advance notice. Return premium on insurer cancellation is computed pro rata, while on insured-requested cancellation some policies use a short-rate (penalty) basis.

Because insurance is a personal contract, the assignment condition bars transferring the policy to a new owner without the insurer's consent; a buyer of an insured building does not inherit the seller's policy automatically.