As the overall U.S. economy continues to struggle, nonresidential construction spending is expected to decrease by 11 percent in 2009 in inflation adjusted terms. Commercial projects including office buildings and retail establishments will see the most significant decrease in activity. On the positive side, prices have dropped for key construction commodities. These are highlights from the American Institute of Architects (AIA) semi-annual Consensus Construction Forecast, a survey of the nation's leading construction forecasters.