At the beginning of his administration, Mayor DeBlasio set a goal to build or preserve 300,000 affordable housing units in New York City by 2026. That initiative, and the general strength of the City’s real estate market, has created a boon in the construction of affordable and supportive housing. The robust real estate market also presents special challenges, as developers of affordable and supportive housing must compete with real estate developers who are now interested in creating market-rate housing in areas that in previous years did not attract their attention. We will discuss the challenges that developers face to find and secure properties that are appropriate for affordable and supportive housing development and the environmental challenges they face in their redevelopment efforts.