What is the relationship between Savills and London in the context of the input sentence. Choose an answer from: 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.

Yolande Barnes, head of Savills World Research, agrees that wealthy overseas buyers looking to diversify their portfolios could give a boost to the top end of the London market.

Answer: headquarters_location