Dubai: The Abu Dhabi Islamic Bank’s (ADIB) in-house rental index, based on the trends recorded at its managed portfolio of 12,000 plus residential units in Abu Dhabi, recorded rental gains of 3.7 per cent in the first three months of the year. The findings are based on data derived from lease renewals and new leases completed during the period and will be updated quarterly. It covers Abu Dhabi Island, which has been subdivided into eight zones and the off-island areas of Khalifa City, Mohammad Bin Zayed City and Shakbout City.