Definitions for "Forebuilding"
Most of the current forebuilding of Clifford's Tower was built in the during the English Civil War as part of the refortification of York Castle. Parts of the medieval structure can be seen on the northern side of the structure. more
A sort of ' Barbican' for a Keep, it protected the entrance, which was usually on the second story, and contained a grand stair and additional chambers (often a chapel).
An extension to the keep, guarding it's entrance.
Keywords:  lobby, block, front, landing, form
A block in front of a keep, to form lobby or landing.