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

Market Movers techMARK 3,106.45 +0.21% FTSE 100 6,524.60 -0.17% FTSE 250 17,442.11 -0.01% FTSE 100 - Risers ARM Holdings (LSE: ARM.L - news ) (ARM) 1,067.00p +2.99% International Consolidated Airlines Group SA (CDI) (IAG) 495.30p +2.29% easyJet (EZJ) 1,596.00p +1.27% Land Securities Group (LAND) 1,243.00p +1.06% Lloyds Banking Group (LLOY) 85.01p +1.02% Old Mutual (Other OTC: ODMTY - news ) (OML) 205.50p +0.88% AstraZeneca (Swiss: AZN.SW - news ) (AZN) 4,185.50p +0.88% London Stock Exchange Group (LSE) 2,430.00p +0.83% 3i Group (III) 516.50p +0.78% Capita (CPI (Other OTC: CPICQ - news ) ) 1,265.00p +0.72% FTSE 100 - Fallers Rolls-Royce Holdings (RR.)

Answer: headquarters_location