This paper reports on the opportunities and challenges of creating partnerships between foundations and government agencies in promoting housing as a platform. Through discussions with philanthropists, the authors examine evidence for "housing as a platform" and assess the challenges that impede public private partnerships. They find that there is a wide interpretation of philosophies that can make partnerships more difficult to establish. While foundation leaders harbor considerable skepticism about developing effective partnerships, they also recognize the benefits of collaborating with public agencies. The authors identify specific topics related to HUD's strategic interests where improvement might advance closer relationships between HUD and private foundations.