84022
He is the co-founder , executive chairman and former CEO of Boston Properties , one of the largest real estate investment trusts in the US .
 organization: Boston Properties; location: US
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Boston Properties, US 
Answer:
 organization: Boston Properties; location: US