Usually there are voluntary dues. They have no legal authority to enact or enforce maintenance or design requirements beyond those established by City ordinances. They foster a democratic process by having bylaws, holding general membership meetings, and electing officers. They have their own newsletter. There is often a council of neighborhood associations and a formal link to city government.
Some cities immediately fax proposed changes to the affected neighborhood association.
A mechanism for communicating with the greatest number of people. A way to involve affected citizens in the decisions at the front end, rather than late in the process and only after citizens feel threatened. A training ground for new leadership and talent. Extension of city staff and workers, as citizens volunteer for cleanups, crime watches, fund-raising, and opinion polling. Can be watchdogs for the city.