The Nation contributor DW Gibson discusses the chaotic, abusive process through which New York City landlords turn affordable housing into luxury apartments. His cover story for the 150th anniversary edition of the magazine, “How to Dump Tenants and Make a Fortune” tackles the predicament of preferential rents, which threaten more affordable apartment units than Mayor de Blasio is aiming to build in the next decade, and explains how they act as a “gentrification insurance” for landlords.