In Chicago, it’s possible to buy an old, deteriorating building for one dollar, provided you promise to save it from the wrecking ball and spend your money renovating it instead. Not only do you avoid the need to demolish and start from scratch---wasting energy and resources in the process---but you can revive a venerable old structure and make it more sustainable as well. Two LEED-certified cases in point: the Optimo Hat Co. plant and corporate headquarters in a former south