As the “green movement” in America progresses, many devotees of architecture and preservation are envisioning tall glass buildings made of copper, stone, or other materials that will save the environment or our wallets. However, one inevitably wonders why we are building new “green” structures when we could just use the ones we already have. Reusing an old water bottle instead of buying a new one is a great idea. Why not reuse the old building instead of building a new one?