Utilize the input text as a context reference, choose the right relationship between Syriza and ATHENS 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.

ATHENS Aug 21 Greece's new Popular Unity party of far-left rebels from the leftist Syriza party will seek a mandate to form a government as the third-biggest group in parliament, a senior party lawmaker told Reuters on Friday.

Answer: headquarters_location