NBA arena upgrades: Nets building green roof, Celtics undergoing makeover and more Author:SI StaffPublish date:Jun 14, 2014NBA arena upgrades: Nets building green roof, Celtics undergoing makeover and morePreliminary Target Center renovation designPreliminary Target Center renovation designPreliminary Target Center renovation designLatest NBA NewsSpurs Add Keldon Johnson to Injury Report vs. RocketsDeMar DeRozan showers Luka Doncic with praise after making triple-double look easyMagic Coach Jamahl Mosley 'Grateful' for Contract ExtensionJa Morant Reacts to Shocking StatInjury Report, Updated Odds (3/12): Oklahoma City Thunder vs. Indiana Pacers