Utilize the input text as a context reference, choose the right relationship between 'Tribune Media' and 'CHICAGO' from the options.
Options: platform, subsidiary, headquarters location, developer

(AP file photo) Tribune Media considering sale of landmark headquarters By: The Associated Press October 9, 2015 12:36 pm 0 CHICAGO — Tribune Media says it's hired real estate investment banking firm Eastdil Secured to explore the sale of its Tribune Tower, its headquarters that sits on three acres along Chicago's Michigan Avenue.
headquarters location