Coinsurance, Market Value, and the Agent's File
Northgate Holdings owns a 1978 strip mall insured under a commercial property policy with a $1,800,000 building limit, 80% coinsurance, replacement-cost settlement, and a $10,000 deductible. At the time of a fire, the building's replacement cost is $2,600,000 and its actual cash value is $1,500,000. The fire damages only the east wing; repair at replacement cost is $800,000, while the depreciated value of the damaged portion is $500,000. Northgate had declined the agency's written recommendation eighteen months earlier to raise the limit to $2,600,000, writing on the proposal, “Market value is only $2.1 million; I'll self-insure the rest.” The agency file contains the signed rejection, photographs, and the carrier's renewal quote. The insurer pays $682,307 after applying coinsurance and the deductible. Northgate demands $800,000, arguing that market value and the agent's advice make the policy fully sufficient. It has not yet repaired the wing.
1. Calculate the insurer's payment and explain whether Northgate can demand the full $800,000 repair estimate.
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The coinsurance requirement is 80% × $2,600,000 = $2,080,000. Because the carried limit is only $1,800,000, the ratio is $1,800,000 ÷ $2,080,000 = 0.86538. On a replacement-cost basis, the payable loss before the deductible is 0.86538 × $800,000 = $692,307.69; after the $10,000 deductible, the payment is $682,307.69, which matches the insurer's figure. Northgate cannot demand $800,000 unless the policy has no coinsurance or an agreed-value provision. Market value is not the measure because the policy insures replacement cost, not resale value, and the owner chose the lower limit. If Northgate does not repair or replace, the carrier may pay only actual cash value: 0.86538 × $500,000 = $432,692, less $10,000 = $422,692, with replacement-cost funds withheld until repair is complete. The owner's real gap is underinsurance, not a coinsurance miscalculation.
2. Assess the agency's errors and omissions exposure and what the file does and does not prove.
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The file helps the agency because it shows a written recommendation to increase the limit and a signed refusal. That is strong evidence the insured made an informed choice, which defeats many negligence claims. But the file is not conclusive. The key question is whether the agent explained the coinsurance penalty, not merely recommended a higher limit. If the letter said only “increase the limit” without showing that a loss would be reduced by the ratio, Northgate may argue the agent failed to explain the consequence. The measurable damages would be the gap between the payment at an adequate $2,600,000 limit ($800,000 − $10,000 = $790,000) and the actual payment ($682,307), or about $107,693, not the entire $800,000. The agency should preserve the letter, the signed rejection, renewal quotes, and any notes of conversations. It should not promise the file guarantees a defense; documentation is evidence, not immunity.
3. Explain how a blanket limit or agreed-value endorsement would change the result.
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A blanket limit applies one limit across multiple locations or buildings and can satisfy coinsurance if the blanket amount is at least the required percentage of the total values. If Northgate had a $3,000,000 blanket limit covering values of $2,600,000, the 80% requirement would be $2,080,000 and the blanket limit would exceed it, so the $800,000 loss would be paid subject only to the deductible, or $790,000. An agreed-value endorsement fixes the value by agreement and usually suspends coinsurance for that item. If the agreed value were $2,600,000, the same result would follow. A lower agreed value, however, would not create money; it would simply make the stated amount the measure, and a total loss would be capped at that amount. These endorsements are not cosmetic: they must be priced, documented, and reviewed at renewal. Northgate should compare the premium savings from the lower limit against the coinsurance exposure it now faces.