Given phrases that describe the relationship between two words/phrases as options, extract the word/phrase pair and the corresponding lexical relationship between them from the input text. The output format should be "relation1: word1, word2; relation2: word3, word4". Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

(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.

Answer: headquarters_location: Tribune Media, CHICAGO