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We’re renovating a brownstone and putting in a parlor floor deck with stairs to the garden. Doing it all up and up and legal, but we’re a little unsure of our architect’s code familiarity and we’d love advice. We know we have to leave 30′ of unobstructed yard behind the house, which leaves our deck at about 10′ deep. What we’re not clear on is whether a spiral stair, that has no storage space beneath it, can penetrate the 30′ or not. As I said, insights would warrant tremendous gratitude..