This volume is the second in our Wharton School Publishing– Milken Institute Series on Financial Innovation. It is dedicated to moving beyond the residential mortgage problems in recent years and looking ahead to new financial innovation solutions for fixing housing markets. From mortgage stones in antiquity to the Homestead Act, building societies, and the emergence of secondary markets in structured-finance products that enable greater access to rental and owner-occupied housing, the requirements for financially and environmentally sustainable buildings to house residential communities is an ongoing challenge. But this is an important objective because it provides an opportunity to create shelter access,.