Read your closing documents carefully.
You will probably find a FLOOD INSURNACE NOTIFICATION document that says something along the lines of
Quote:
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...Therefore we hereby understand and agree that is, any time prior to, or after the closing of our loan, the lender is able to determine that the above property is located in a Special Flood Hazard Area and flood insurance is required, we hereby authorize the lender to secure flood insurance of the required amount and type to be placed upon said property....
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Your signature will be found at the bottom of the document.
This was taken from a recent Indiana closing document.
Provided you agreed to a similar provision at closing, they will have every right to ensure that they do not lose their collateral on the loan. I would be quite surprised if your lender let you get a mortgage without such a provision.
Your problem is that the extra lot is part of the flood zone - and that lot is part of the mortgaged property. If you cannot convince the lender that you do not need flood insurance, consider refinancing so that only your house and main lot are on the mortgage and your extra lot is paid off.