Top 10 expensive office locations around the world. : Wondering what an office space might cost in the financial hubs of the world? CBRE, a US commercial real estate services and investment firm, released a report of the most expensive office spaces around the world. Here are the top 10 (Image Source: Reuters) No.10 | London City | The City of London is an expensive area for an office considering it is the primary central business district of London. Office spaces cost up to Rs 9553.38 per square feet. (Image Source: Reuters) No.