• Better Buildings Multifamily Program: Through the Better Buildings Challenge, the DOE and Housing and Urban Development are partnering with both market rate and affordable housing owners as well as public housing agencies to cut energy waste and help families save on their utility bills. Through the Challenge expansion announced in December 2013, 50 multifamily partners – representing roughly 200,000 units and over 190 million square feet – have committed to cutting their energy use by 20 percent in ten years.