Connaught Place in Delhi slipped four notches to become the world's eighth most expensive office location as rentals remained stable and rupee weakened in 2013, said property consultant Cushman & Wakefield. 

Connaught Place, located in central Delhi, was 4th in last year's ranking. 

"New Delhi's Connaught Place fell four notches to settle as eighth most expensive location in the world," C&W said in a report that ranks locations across Americas, Europe, Asia- Pacific, Middle East & Africa. 

London's West End emerged as the world's most expensive office market, retaining its position ahead of Hong Kong which is ranked second. 

Of the top ten markets, only London and New York have seen a rise in rental values, while most other top ten markets recorded a slowdown in rental values over the previous year.