Video: John Heubner questions safety of Greystone tear-down. Video by Bill Lescohier. The state tear-down of Greystone’s massive Kirkbride Building is more than a blow to historians; it’s also dangerous to the general public, John Heubner, president of Preserve Greystone, told a rally on Sunday. “Apparently, they have botched the execution of their own plan,” said…