After many months of debate over proposed revisions and an unprecedented number of public comment periods, the latest version of the USGBC's LEED green building rating system, dubbed LEED v4, will go into effect this fall after it was successfully passed by ballot vote of USGBC membership, the organization announced this morning. The final overall vote was 86 percent in favor of adopting LEED v4. The minimum overall percentage of votes needed for passage was 66.7 percent.