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In 2008 the  San Francisco  Business Times reported that  Levi Strauss Co.  may consider moving the headquarters out of San Francisco once the lease in Levi's Plaza expired on December 31 2012 .
 city of headquarters: San Francisco, Levi Strauss Co.
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
Answer:
 city of headquarters: San Francisco, Levi Strauss Co.