It was a pleasure having the opportunity to meet with you yesterday to discuss the proposed loan on the ____.
After reviewing the alternatives you suggested, I believe that it would be best to collateralize this loan with (form of collateral)
I am instructing my assistant to prepare a package consisting of all necessary documents and to mail them to your attention today. I would be most appreciative if you would arrange to have the loan documents drawn as soon as possible, so that we can proceed further. I really wish to thank you for your cooperation in this matter and am looking forward to the continuance of a long and mutually beneficial relationship between us.