24 C.F.R. § 241.586
Minimum principal loan amount
A mortgagee may not require, as a condition of providing a loan insured under this subpart, that the principal amount of the mortgage exceed a minimum amount established by the mortgagee.
A mortgagee may not require, as a condition of providing a loan insured under this subpart, that the principal amount of the mortgage exceed a minimum amount established by the mortgagee.