My interpretation is that it isn't an option if they have an NMLSR ID. If they have an NMLSR ID (even if for a commercial purpose transaction) then it must be reported. If a commercial lender does not have one they are not required to obtain one solely for HMDA, but in your example if they already have one then you must report the ID on all of that lenders loans on the LAR regardless of consumer or business purpose.
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CRCM