A loan, advance of credit or purchase of an obligation representing a loan or advance of credit made for the purpose of financing improvements or additions to a project covered by a mortgage insured under any section of the Act or Commissioner-held mortgage, or equipment for a nursing home, intermediate care facility, board and care home, assisted living facility, or group practices facility, may be insured pursuant to the provisions of section 241 of the Act and such terms and conditions established by HUD.