This session will review “Building Block” provisions in the ADA and ABA Accessibility Standards (Chapter 3) that are the foundation for many technical specifications in standards. These requirements apply to a wide range of elements, spaces, and rooms covered by the standards. They address ground and floor surfaces, clear floor space, knee and toe clearances, turning space, reach ranges, operable parts, and protruding objects. Presenters will address common sources of confusion and frequently asked questions about these provisions.