A public housing agency may establish other requirements or limitations for families to purchase housing under a homeownership program under this section, including requirements or limitations regarding employment or participation in employment counseling or training activities, criminal activity, participation in homeownership counseling programs, evidence of regular income, and other requirements. In the case of purchase by an entity for resale to low-income families, the entity shall sell the units to low-income families within 5 years from the date of its acquisition of the units. The entity shall use any net proceeds from the resale and from managing the units, as determined in accordance with guidelines of the Secretary, for housing purposes, such as funding resident organizations and reserves for capital replacements.