The term KEYSTONE PLACE can be solved by the four-letter word ARCH. An ARCH is a curved structure that spans an opening and is often used in architecture. It is typically constructed of stone, brick, or concrete and is often used to support the weight of a building or bridge. The keystone is the central stone at the top of an ARCH, which locks all the other stones into place. Keystone Place is likely a building or bridge that features an ARCH as its main structural element.