The Department of Housing and Community Development (DHCD) offers several resources to help small housing providers (also known as landlords) understand and comply with the District of Columbia’s housing laws. Programs and Services of Interest: Affordable Dwelling Units (ADUs) Condo and Co-op Conversion and Sales Housing Resource Center (HRC) Inclusionary Zoning Housing Program (IZ) Portfolio and Asset Management (PAMD) Rent Control Tenant Opportunity to Purchase (TOPA) English