Utilize the input text as a context reference, choose the right relationship between SABMiller and London 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.

This month, the two year old partnership based in a London townhouse steered UK brewer SABMiller through hardball negotiations in its more than $100 billion acquisition by AB InBev.

Answer: headquarters_location