The amount of office space being built in central London rose by 24 per cent in the six months to the end of March, a survey of construction activity by advisory firm Deloitte found earlier this year — the second-biggest increase in 20 years.
Take context from the input text and decide on the accurate relationship between 'Deloitte' and 'London' from the options provided.
Options: owned by, stock exchange, location of formation, member of