Apparently the line of business finds it easier to require insurance on all buildings, rather than to do the due diligence to determine if any of the buildings are actually in the flood zone and require insurance.
Since in many cases, insurance has to be force placed on loans in default, I'm wondering what exposure that brings to the table.
The line of business really needs to re-think this strategy.
The issue I see is how do you know if the borrower provided policy is rated properly? I'm assuming you pull a determination to find out that the property is partially in an SFHA. Do the zones on the borrower provided policies match the zone listed on your determinations? I would imagine that if this is going on the way you are describing, the borrower-provided policies are rated X when your determinations show an A or V zone. Regulators have cited these discrepancies as inadequate insurance in this area. You may be able to get out of criticism during an exam when the due diligence is completed then, but why not just get it over with on the front end.
Also, how are you forceplacing? Do you forceplace using the higher rated (and more expensive) zone on your determinations? I think you could have a real problem if the force-placed policy is written on an A or V zone and your collateral building is actually in an X zone. If nothing else, a customer with a good lawyer could sue you for overinsuring his property and overcharging him on the forceplaced insurance.