From page 28 of the Mandatory Purchase Guidelines:
Lenders should seek the assistance of property insurance agents or companies when determining the appropriate flood insurance coverage amounts, as they do for other lines of insurance. . . . .
However, in these situation I would hope the current loan balance would be the lesser of the required coverage amount. Especially on a 10 year old loan.
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The opinions expressed are mine and they are not to be taken as legal advice.