Take context from the input text and decide on the accurate relationship between 'British Land' and 'London' from the options provided.
Options: chief executive officer, operator, headquarters location, platform

The chairmen of FTSE 100 engineering giant Babcock International (LSE: BAB.L - news ) , British Land (LSE: BLND.L - news ) and the AA have put their names to an open letter from Heathrow chairman Sir Nigel Rudd urging ministers to support expansion of the west London airport.
headquarters location