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I am considering purchase of a 4th floor 2 bedroom, the top floor of a brownstone. The unit has exclusive roof rights. Current owners have a partial wood deck on the roof. it’s nice, but the access to the roof is via attic stairs in the hallway that pull down with a string. What kind of stairs could I put in as an alternative? Spiral stairs? If so, how much construction on the roof would need to be done to accomodate the new entry? Thanks in advance for ideas, troubleshootings, referrals, etc.