TSC-2018 - Building Performance Levels TSC-2018 - Building Performance Levels are explained in detail under this title. TSC-2018 - Building Performance Levels (3.4) Next Topic TSC-2018 - Building Performance Requirements Related Topics TSC-2018 - Requirement / Design Assumptions TSC-2018 Building Importance Categories and Building Importance Factors TSC-2018 Seismic Design Category TSC-2018 - Building Base and Building Height TSC-2018 - Building Height Category