The Housing Development Growth Amendment Act of 2025 establishes an Office of Social Housing Development within the District of Columbia's executive branch, focusing on the construction, maintenance, and management of mixed-income housing. The bill mandates that at least two-thirds of the units in these developments be family units rented as permanently affordable for extremely, very, and low-income households. It also creates a governance framework for tenant involvement, environmentally sustainable building standards, and public amenities. The Office will be led by a Director appointed by the Mayor and will include a governing board of residents with expertise in affordable housing. Funding will be allocated from the Housing Production Trust Fund to support the Office's activities, and District-owned properties can be converted into social housing developments eligible for loans and grants.

Additionally, the bill emphasizes tenant governance by requiring the establishment of tenant association leadership boards and mandates regular training for these boards. It ensures tenant rights, such as the right to apply for Emergency Rental Assistance and limits on rent to no more than 30% of income. The legislation also sets stringent environmental standards for social housing developments, including net-zero emissions and the prohibition of natural gas. It requires the preservation of at least 75% of street-level commercial space for community amenities and encourages the hiring of tenants for property management roles while favoring companies that utilize union labor. Overall, the bill aims to enhance affordable housing options, promote sustainability, and ensure equitable employment opportunities within social housing projects.