The “L” stands for leadership. Every LEED version has been painful and caused market outcry, yet the market adapted and great progress was made. Keep in mind that LEEDv4’s original working title was LEED 2012. I saw at Greenbuild solid evidence that manufacturers had earnestly responded to LEEDv4 criteria and competent MEP engineers offered compliant energy solutions using existing technologies. The early adopters are making the transition, but the mass market will not adopt LEEDv4 until it is mandatory. It must be pushed. USGBC used to claim that the codes were the floor and LEED was the ceiling. This delay may reverse that as two years from now, so many codes will have taken exponential leaps forward. Worst of all is the lost momentum toward 2030 goals. With only fifteen years to go, a two year delay is a substantial stumble. Thank goodness for code bodies that realize the seriousness of our mission.