When you say 'property' are you speaking of the land or the structure? I believe that if any part of the structure is in the flood hazard area, it's treated as if the whole structure was. However, if only part of the customer's land is in the flood hazard area, I believe you can (sorry don't know the details), get a survey to establish the location of the structure to determine if it is in the flood hazard area. I'm sure others know the particulars.
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I hear and I forget. I see and I remember. I do and I understand.--Confucius