International Downtown Association | 5,396 followers on LinkedIn. IDA is the essential membership organization for professional place management leaders worldwide. | The International Downtown Association is the premier organization for urban place professionals who are shaping and activating dynamic city center districts. Our members are downtown champions who bring urban centers to life, bridging the gap between the public and private sectors. We represent an industry of more than 2,500 place management organizations, employing 100,000 people throughout North America and growing rapidly around the world.