The term 'building surrounder' can be summarized as a LEDGE, which is a flat surface that projects from a wall or other structure. It is typically used to provide protection or decoration around the perimeter of a building. LEDGE can also be used to create a visual barrier between two areas, such as a garden and a patio. In addition, it can be used to provide a place for plants to grow or to provide a place to sit and relax.