With 31 owned or managed buildings, Mission Housing Development Corporation (MHDC) is one of the largest nonprofit housing organizations in San Francisco. Since 1971, MHDC has worked to preserve high quality affordable housing for low to moderate-income families, senior citizens, and individuals with special needs around the Mission District. The organization currently oversees 1,000 units and over 3,000 residents. Six additional sites are being considered for new residential units, while 350 rental units are currently under construction. Along with housing services, the corporation offers computer learning centers, job training, and academic enrichment programs tailored for the community's youth and disabled persons.