Utilize the input text as a context reference, choose the right relationship between YPF and BUENOS AIRES 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.

BUENOS AIRES Aug 18 Argentina's state-run energy firm YPF will pay about $122 million for stakes in two locally based petrochemical companies as part of its growth strategy to add value to locally produced crude oil, the company said on Tuesday.

Answer: headquarters_location