modern spiral staircase By nycinteriordesign|2011-02-21T15:37:50-05:00February 21st, 2011| Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInWhatsAppTumblrPinterestVkEmail About the Author: nycinteriordesign NYC Interior Design is a full service high end residential firm. We specialize in penthouses, landmarks, townhouses and estates throughout the tri-state region.