THE level of void office space in central Manchester is increasing as demand for secondary space declines, according to Colliers.The firm said that the second quarter of 2012 saw the first increase in available office space in Manchester since the middle of 2009, but this is due entirely to the increase in Grade B secondary stock.The amount of non-refurbished Grade B stock increased by 16% in the first six months of 2012 and now accounts for 29% of the available space in the market, compared with just over 22% in 2008.Colliers arg......for the full story register now for free or login below...