According to Green Infrastructure and Buildings Prerequisite, Indoor Water Use Reduction, the indoor water usage of a new building or buildings undergoing major renovations (nonresidential buildings, mixed-use buildings, and multifamily four stories or more), must average at least Exit S 3 4 5 6 Calculator 10% less than in baseline buildings. 20% less than in baseline buildings. 30% less than in baseline buildings D 50% less than in baseline buildings