healthcare, employment, education, childcare, financial literacy and other community-based supportive services. . 4. Construction of private market affordable housing (a) Purpose It is the purpose of this section to fund the construction of 2,500,000 private market affordable housing dwelling units over 10 years. (b) Authorization of appropriations There is authorized to be appropriated $20,000,000,000 for each of fiscal years 2021 through 2030 for crediting to the Housing Trust Fund under section 1338 of the Housing and Community Development Act of 1992 (12 U.S.C.11 4568), which amounts shall be available only for assistance for production of new dwelling units that comply with the requirements of such section 1338 and this section. (c) Use Notwithstanding any provision of the United States Housing Act of 1937 ( 42 U.S.C. 1437 et seq.), all units developed using amounts made available pursuant to this section shall remain affordable housing units for the entire useful life of such dwelling units. (d) Location and accessibility All dwelling units developed using amounts made available pursuant to this section shall be located in a manner that complies with such standards as the Secretary of Housing and Urban Development (in this subsection referred to as the Secretary ), in conjunction with the Secretary of the Department of Transportation, shall establish to ensure proper integration of housing and public transit and ensure that residents of such units have access to sufficient transportation options. Standards should ensure that such units should be integrated with public transit and vehicle alternatives such as walking and biking and should accommodate differences between a transit hub in a town or reservation compared with a large city. (e) Environmental standards All dwelling units developed using amounts made available pursuant to this section shall comply with such standards as the Secretary shall establish to ensure units are designed, built, and operated according to the highest possible environmental