Utilize the input text as a context reference, choose the right relationship between Legg Mason and Baltimore 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.

With $118 billion under management at March 31, ClearBridge is the largest equity unit of Baltimore asset manager Legg Mason Inc .

Answer: headquarters_location