The 50/30/20 Mixed-Income Program combines a first mortgage (funded with proceeds from the sale of variable or fixed rate tax-exempt bonds) with a second mortgage (funded with New York City Housing Development Corporation (HDC) corporate reserves) to finance multi-family rental housing affordable to low- and middle-income families. Eligible projects must ensure that 20 percent of the units are affordable to households earning up to 50 percent of the Area Median Income (AMI) and at least 15 percent of these units are affordable to households earning up to 40 percent of AMI. A minimum of 30 percent of the units must be affordable to middle-income households, and a maximum of 50 percent of the units can be rented at set at market rates. Projects may have a range of affordability tiers.