The document discusses harm reduction housing models presented by DESC (Downtown Emergency Service Center) at a conference on homelessness. DESC provides various housing and treatment services in Seattle for over 2,000 vulnerable individuals each day with disabilities like mental illness, drug/alcohol addiction, and histories of homelessness, abuse, and trauma. DESC follows a housing first model placing people directly into housing from the streets without treatment preconditions and using a harm reduction approach rather than mandated abstinence.