Crain's Chicago Business reports that BW Chicago, Business Week's first city-focused publication, is no more. After just eight issues, publisher McGraw Hill Cos. is shutting down the monthly magazine, making the June issue its last. The cause was slow ad sales, according to several people familiar with the situation. BW Chicago, which was run out of Business Week's Chicago bureau, was a prototype for what was envisioned to be a series of city-based supplements to the national magazine. That plan now seems shelved.