What's an Acceptable Deductible for Flood?

We have a loan closing for a commercial property. The loan amount is $183,000 and the building is valued at $240,000. The borrower's flood policy is for $183,000 with a $50,000 deductible. He does not have sufficient cash on hand to handle a deductible this large. I told the lender the deductible is too high for the coverage amount, but the borrower is insisting on keeping his deductible at $50k. The lender says they are fine with the deductible being this high. Does that make this acceptable?