(a) Occupancy and rent restrictions with respect to housing acquired pursuant to this chapter shall either meet the requirements of subparagraphs (A) and (B) of paragraph (1) or the requirements of paragraph (2), as follows:

1. (1)

   1. (A) Not less than 20 percent of the total number of units in a multifamily rental housing development financed, or for which financing has been extended or committed, pursuant to this chapter from the proceeds of the sale of bonds of each bond issuance of the city or county shall be for occupancy on a priority basis by lower income households, as defined by Section 50079.5. If a multifamily rental housing development is located within a targeted area project, as defined by Section 103(b)(12)(A) of Title 26 of the United States Code, not less than 15 percent of the total number of units financed, or for which financing has been extended or committed pursuant to this chapter, shall be for occupancy on a priority basis by lower income households. Not less than one-half of the units required for occupancy on a priority basis by lower income households shall be for occupancy on a priority basis for very low income households, as defined by Section 50105.

   2. (B)

      1. (i) With respect to multifamily rental developments that are not mobilehome parks, the rental payments on the units required for occupancy by very low income households paid by the persons occupying the units (excluding any supplemental rental assistance from the state, the federal government, or any other public agency to those persons or on behalf of those units) shall not exceed 30 percent of an amount equal to 50 percent of area median income. If the nonprofit organization elects to establish a base rent for all or part of the units for lower income households and very low income households, the base rents shall be adjusted for household size. In adjusting rents for household size for this purpose, it shall be assumed that one person will occupy a studio unit, two persons will occupy a one-bedroom unit, three persons will occupy a two-bedroom unit, four persons will occupy a three-bedroom unit, and five persons will occupy a four-bedroom unit.

      2. (ii) With respect to mobilehome parks:

         1. (I) Where a resident rents both the mobilehome and the space occupied by the mobilehome, for spaces and mobilehomes required for occupancy by very low income households, the total rental payments paid by the household on the mobilehome and the space occupied by the mobilehome (excluding any supplemental rental assistance from the state, the federal government, or any other public agency to that household or on behalf of that space and mobilehome) shall not exceed 30 percent of an amount equal to 50 percent of the area median income, adjusted for household size as appropriate for the unit that occupies the space.
         2. (II) Where a resident is the registered and legal owner of the mobilehome, is not making mortgage payments for the purchase of that mobilehome, and rents the space that the mobilehome occupies, for spaces and mobilehomes required for occupancy by very low income households, the total rental charge for occupancy of that space, excluding a reasonable allowance for other related housing costs determined at the time of acquisition of the mobilehome park by the nonprofit corporation, excluding any supplemental rental assistance from the state, the federal government, or any other public agency to that household on behalf of that space and mobilehome, shall not exceed 30 percent of 50 percent of the area median income, adjusted for household size as appropriate for the unit that occupies the space.
         3. (III) Where a resident is the registered owner of the mobilehome, is making mortgage payments for the purchase of that mobilehome, and rents the space occupied by the mobilehome, for spaces and mobilehomes required for occupancy by very low income households, the rental charge for occupancy of a space by a mobilehome, exclusive of any charges for utilities and storage (excluding any supplemental rental assistance from the state, the federal government, or any other public agency to that household or on behalf of that space and mobilehome), shall not exceed 15 percent of 50 percent of the area median income, adjusted for household size as appropriate for the unit that occupies the space.
         4. (IV) In adjusting rents for household size, either the occupancy standards established in clause (i) of subparagraph (B) of paragraph (1) of subdivision (a) or the alternative standards that assume that one person will occupy a recreational vehicle, two persons will occupy a single-wide mobilehome, and three persons will occupy a multisectional mobilehome may be utilized.
2. (2) The multifamily rental housing development is a “qualified low-income housing project,” within the meaning of Section 42(g) of the Internal Revenue Code (26 U.S.C. Sec. 42), because it meets the criteria set forth in Section 42(g)(1)(B) and (2) of the Internal Revenue Code.