This document discusses public-private partnerships (P3s) for infrastructure projects. It defines P3s and describes common P3 models including design-build, design-build-finance-operate, and long-term leases. P3s can help address infrastructure funding gaps by leveraging private financing and efficiencies. Massachusetts law allows for P3s through design-build statutes and special acts. The document outlines considerations for successful P3 projects including clear revenue streams, risk allocation, and public support. P3s may be most applicable for water/wastewater projects and developing underutilized public real estate assets.