A proposal is in the works to create one of the largest permanent supportive housing projects in the city. The $41 million building at Seventh and H streets also is poised to become the city's newest single-resident occupancy, or SRO, structure. The infill project would feature sustainable design and materials, so the developers and architects will ask the U.S. Green Building Council to certify it as a sustainable building. But perhaps most unique about the public-private project being developed by Mercy Housing and the Sacramento Housing and Redevelopment Agency is that it would offer support services to formerly homeless people in innovative and mixed-population permanent housing. Its