Preservation Chicago is a nonprofit organization dedicated to protecting and promoting the historic architecture and cultural heritage of Chicago. Founded in 2000, it advocates for the preservation of significant buildings and neighborhoods, raising awareness about the importance of maintaining the city's unique character. The organization engages in various activities, including educational programs, community outreach, and collaboration with local government and other stakeholders. Preservation Chicago also publishes an annual list of the city's most endangered buildings, highlighting structures at risk of demolition or neglect, and works to foster appreciation for Chicago's rich architectural history.