Work necessary in order to proceed which wasn’t in the original scope. Dusty work needing expensive tools, bits and blades. Sawing into the hardest concrete in Manhattan. Eighty year old concrete fabricated with large quartz pebbles – concrete fabricated before the mafia got involved. Also removal of millwork I had planned to re-use but now cannot because it’s so old and brittle. Three piece compound moulding not even available today.