If a loan is to a legal entity customer and your bank is required to perform CIP, then you are required to obtain the beneficial ownership information. If your bank is not required to perform CIP, then it is not required to elicit the beneficial ownership information.
Generally, in a participation loan you are not opening an account so neither requirement would be applicable.
Not reflected in that analysis is the fact that you should want the information as a part of your underwriting process.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.