Utilize the input text as a context reference, choose the right relationship between Northern Trust and Chicago from the options. 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.

Founded in Chicago in 1889, Northern Trust has offices in the United States in 19 states and Washington, D.C., and 20 international locations in Canada, Europe, the Middle East and the Asia-Pacific region.

Answer: headquarters_location