I lived across the street for 6 years and the sandstone always looks wet. My guess is they treated it during restoration work which included roofing and some façade masonry work including bird proofing done, as I recall, about 8-10 years ago. My old apartment was on the 8^th floor above the former Balducci's market. We faced the clock tower and the carved gable end which included the seal of New York including virtually life-size figures.

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