In offering insurance and other forms of credit enhancement, the Department shall adopt eligibility standards that are reasonable to aid in: financing the purchase, construction, or rehabilitation of: housing projects; special housing facility projects, consisting of the acquisition, rehabilitation, improvement, renovation, construction, financing, or refinancing of a building that: provides common, shared, or independent living, dining, kitchen, sanitary, and sleeping facilities; may include supportive services or supervisory live–in personnel for individuals with specialized housing needs; and may include nonresidential facilities to serve individuals with special needs who may or may not be residents of the special housing facility; rehabilitation projects, as defined in § 4–901 of this article; energy conservation projects; solar energy projects; public purpose projects; infrastructure projects; or business projects; and the sale or other transfer of an obligation that is: denoted as a bond, note, collateralized obligation, grantor trust, conduit, or other form of security or obligation; and backed directly or indirectly by a mortgage or a payment derived from a mortgage. The standards adopted under subsection (a) of this section shall ensure that a lender benefiting from insurance or other credit enhancement provided by the Department is responsible and able to service the loan. A determination by the Secretary is conclusive if it relates to the eligibility of a project, facility, or undertaking for: insurance or other credit enhancement; or other action taken by the Department, in its own name or in the name of the Fund, under this subtitle.