Minstar Inc. said it will close its...

Minstar Inc. said it will close its AMF Inc. subsidiary’s corporate headquarters in White Plains, N.Y., and consolidate those operations with Minstar’s at that firm’s Minneapolis headquarters . . . Times Mirror Co. and Knight-Ridder Newspapers have completed the previously announced sale of their jointly owned Long Beach cable-television system to Simmons Communications . . . Western Union has won a 25-day extension on an interim financing pact with its 31 lending banks.