Doing Business with HDC HDC is a mortgage lender for affordable multi-family housing.  Its programs offer private for-profit and non-profit developers with low-cost mortgage loans that support the new construction, acquisition, and rehabilitation of rental and cooperative housing to meet the demand of quality affordable housing for individuals and families whose wages span the economic spectrum. Funds are raised for HDC's financing programs through the sale of tax-exempt and taxable bonds in the municipal bond market. The Corporation's strong record of financial performance has enabled it to receive a credit rating of AA from Standard & Poor's Ratings Services.