For purposes of this article:
(a) “Qualified buyer” means persons and families of low or moderate income, as that term is defined in Section 50093 of the Health and Safety Code.
(b) “Qualified nonprofit corporation” means a nonprofit corporation organized pursuant to Section 501(c)(3) of the Internal Revenue Code that has received a welfare exemption under Section 214.15 of the Revenue and Taxation Code for properties intended to be sold to low-income families who participate in a special no-interest loan program.