The document discusses cross section drawings of buildings. It explains that cross sections show internal views of a building by slicing through it from above. The number of cross sections needed depends on a building's complexity. Key areas that may require cross sections include walls, stairs, floors, and custom features. The document then outlines the 9 steps to draw a cross section, including choosing a section line, drawing the building envelope, floors and ceilings, walls and windows, and adding a title block with project details.