Mumbai slipped by one place to sixth in the list of the world's most expensive office locations in 2011, according to global realty consultant Cushman & Wakefield.

The 2011 list was topped by Hong Kong, while London and Tokyo came second and third in the rankings, which valued Mumbai's office occupancy cost at USD 114 per square foot a year. India's financial capital occupied the fifth position in 2010, Cushman & Wakefield (C&W) said.