The document discusses a case study of the Bronx Healthy Buildings Program, a cross-sector collaboration in the Bronx aimed at reducing asthma triggers and health issues. The program is led by the Northwest Bronx Community and Clergy Coalition and involves partnerships between community organizations, a hospital, city agencies, and others. The collaboration addresses social determinants of health by providing home assessments and upgrades, jobs and training, and community leadership development. Key challenges discussed include balancing partner interests, power differentials, and building relationships.