Controlled Demolition, Inc. (CDI) was hired to implode the tower. No blueprints could be found for the tower, which CDI president Mark Loizeaux considered unusual. Demolition crews discovered secret stairwells in the tower, and Loizeaux said, "We have learned everything as we have gone in. It was a very strange structure, very unique." A week before the Landmark tower was demolished, crews removed the remaining asbestos from the low-rise structures and subsequently tore them down. Crews then spent the final days of demolition by drilling in the tower to weaken and prepare it ahead of its planned implosion. Less than 100 pounds of dynamite was placed in certain locations throughout the tower's first four floors.