The project involved the removal of the granite stairs and marble parapets and the construction of a new concrete sub-slab with fully integrated drainage mat. The granite stairs and benches are anchored over pedestals, utilizing a unique rain screen approach to promote effective drainage, address existing moisture-related problems, and prolong the lifespan of the structure and masonry.
The top flight of reconstructed granite stair treads and benches was set at the Grand Stair. The work represents a significant milestone for the project, which involves the complete reconstruction of the waterproofing system of the monumental stair structure, which spans over Madison Avenue and connects the terrace of the New York State Museum with the Plaza to the north.