The Flatiron on Fifth Ave. Ruth 10 years ago The Flatiron Building Built in 1902. Maybe the most photographed building in New York City. Here’s one more. Share this: Share on Facebook (Opens in new window) Facebook Share on X (Opens in new window) X Share on LinkedIn (Opens in new window) LinkedIn Email a link to a friend (Opens in new window) Email Share on Pinterest (Opens in new window) Pinterest Share on Tumblr (Opens in new window) Tumblr Share on WhatsApp (Opens in new window) WhatsApp