At appropriate stages in the application and approval procedure for a loan guarantee or interest subsidy, the applicant shall furnish to the Secretary a memorandum or opinion of legal counsel with respect to the legality of any proposed note issue, the legal authority of the applicant to issue the note and secure it by the proposed collateral, and the legality of the issue upon delivery. "Legal counsel" means either a law firm or individual lawyer, thoroughly experienced in the long-term financing of construction projects, and whose approving opinions have previously been accepted by lenders or lending institutions. The legal memorandum or opinion to be provided by legal counsel in each case shall be as follows:
42 C.F.R. §57.1511