Whenever you are in a building context, that is, when you are looking at something inside of a single building,* a sidebar menu opens on the left side of the page. You can click on each item in the sidebar to go to the appropriate page for the building. Some of the links in the sidebar also open subordinate links.
Note: Custom graphics that would otherwise be inside of a building context may appear without the left navigation. This is an option that can be specified by the graphic creator in Tracer Graphics Editor.