Utilize the input text as a context reference, choose the right relationship between apartment 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.

The last luxury apartment complex to spark a debate over the price of property in central London was Clarges Mayfair - built by the leading UK property group, British Land (LSE: BLND.L - news ) .

Answer: location_of_formation