Diane Lefer: Slum housing has a negative impact on residents’ health–even when the building doesn’t collapse on top of you while you sleep which is what happened to some tenants of slumlord Frank McHugh. But today, more than 3,000 low-income families enjoy better health and almost as many now live in improved housing thanks to the Healthy Neighborhoods, Same Neighbors Collaborative, a groundbreaking partnership among community organizers, grassroots nonprofits, and tenants from South Los Angeles and downtown, all working in coordination with city and county agencies, legal professionals and health care providers.