mumbai strong performance by the manufacturing bfsi itites and other service sectors resulted in high demand for office space across the country during the last five years said a knight frank research report released on friday as much as1685 million sq ft office space was absorbed from 20082012 across six major cities namely mumbai national capital region ncr bengaluru pune chennai and hyderabad itites sector was the primary demand driver of office space in cities like bengaluru chennai pune and hyderabad accounting for more than 50 of the total absorption it said however demand in mumbai and the ncr was driven by a relatively diverse set of sectors as a large number of occupiers prefer to locate their corporate offices here the report said that robust absorption of office space during this period was accompanied by a relatively higher incremental supply of 2185 million sq ft resulting in total office stock doubling such huge supply led to vacancy levels increase from 15 in 2007 to 19 by end 2012 the demand supply dynamics during the previous five years were clearly in favour of occupiers and this can be substantiated by studying the movement in rental values across six major cities from 20072012 rental value in the central business district of these cities declined in the range of 3 to 28 it said