When Mike B. found this Second Empire house in Denver, Colorado, it was the scariest house on the block, but it also had the most potential. The scaling brick and mortar were softened to mere dust. Studs and joists had been cut out to make way for ductwork and plumbing. Rotted eaves allowed squirrels to live in the mansard attic. The windows were broken. Cockroaches were everywhere. The place was barely livable.