Re: "Abundance of Caution - To use this exemption, the institution must document that the extension of credit is well suported by income or other collateral of the borrower and that the real estate is being taken as additional collateral" That is from the Summary and Explanation of the OCC Bulletin June 7, 1994. I think you'd want clear and concise documentation, in the form of the loan approval or a memo, detailing the basis for using abundance of caution.
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Just working here until I get my letter from Hogwarts.