; or (B) there is a shortage of housing units available for sale that are affordable to individuals with an income that is at or below the area median income and median home prices have risen on average over the preceding 3 years substantially faster than the area median income. (4) Use of funds Grants received under this subsection shall be used to fund the construction of rental housing units that are affordable to residents making less than 120 percent of the area median income. (5) Labor laws (A) In general All laborers and mechanics employed by contractors or subcontractors in the performance of construction work financed in whole or in part with a grant received under this subsection shall be paid wages at rates not less than those prevailing on similar construction in the locality as determined by the Secretary of Labor in accordance with subchapter IV of chapter 31 of title 40, United States Code (commonly known as the Davis-Bacon Act ). (B) Exception Subparagraph (A) shall not apply with respect to— (i) the rehabilitation of residential property if the property contains less than 8 units; or (ii) construction carried out by employees of the eligible entity receiving the grant under this section. (6) Regulations The Secretary of Housing and Urban Development shall promulgate regulations to carry out this subsection, including with respect to the metrics the Secretary shall use to determine eligibility for a grant under this subsection. (7) Appropriations Out of funds in the Treasury not otherwise appropriated, there is appropriated to the fund established under this subsection $4,000,000,000 for fiscal year 2019. II Reversing the legacy of housing discrimination and government negligence 201. Down payment assistance program for communities formerly segregated by law (a) Definitions In this section: (1) Eligible resident The term eligible resident means a resident of a geographic area, as defined by the Secretary by regulation under subsection (e), who— (A) is a first-time homebuyer