New Delhi, Dec 1 (IANS) Delhi has again joined the list of 10 cities worldwide that command the highest rentals for office space, says a report released Tuesday by global realty consultancy CB Richard Ellis. World's Most Expensive Homes Countries billionaires could buy Mumbai dropped one place to the seventh position, the report titled 'The Semi-Annual Global Office Rents' added. 'While Mumbai continues to remain in the top 10, Delhi has re-joined the top 10 ranking of most expensive office markets after two years,' said Anshuman Magazine, chairman and managing director, CB Richard Ellis South Asia. 'Although the rentals in the Delhi central business district have remained stable for the past six months, it has moved up to the 10th position primarily due to other global cities declining significantly in office rentals,' Magazine said. Delhi moved up from 12th to 10th position, while London reclaimed its position as the world's most expensive offic...