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. (iii) Environmental standards Such units shall comply with such standards as the Secretary shall establish to ensure such units are designed, built, and operated according to the highest possible environmental standard, with a focus on minimizing energy costs and achieving carbon neutrality. (iv) Tenancy restrictions A public housing agency receiving assistance made available pursuant to this subsection shall not refuse to rent a dwelling unit developed with such assistance or otherwise discriminate in the rental of such a dwelling unit based on an individual’s criminal record or immigration status. (v) Anti-discrimination A public housing agency receiving assistance made available pursuant to this subsection shall not refuse to rent a dwelling unit developed with such assistance or otherwise discriminate in the rental of such a dwelling unit because of the sexual orientation or gender identity of any person. (vi) Affirmatively furthering fair housing A public housing agency receiving assistance made available pursuant to this subsection shall comply with the final rule entitled Affirmatively Furthering Fair Housing (80 Fed. Reg. 42272 (July 16, 2015)). (vii) Supportive services A public housing agency receiving assistance made available pursuant to this subsection shall develop a supportive services plan to ensure that residents have access to free, voluntary programs that address the needs of people experiencing chronic homelessness and housing instability. Services provided should include assistance with accessing 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