What is the relationship between land and Seattle 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.

Economic growth and demand for office space fueled by the expansion of technology companies in cities like Seattle and San Francisco has made it harder for Skanska to find land at reasonable prices.

Answer: location_of_formation