Rents for luxury homes rose by 8.9% in the year to June 2011, this represents the fifth consecutive quarterly rise in global rents.
Zurich and London continue to top the rankings table, recording 18.2% and 15.2% annual growth respectively.
Hong Kong and New York recorded the strongest quarterly growth, with rents rising by 4.6% and 4.1% respectively in the three months to June 2011.
The global index now stands 36.5% higher than its lowest point in Q1 2010 but still 30.0% below its market peak Q3 2008.