1) The building and how it got its commonly used name?
2) One of the most popular slang / fad expressions to appear in the U.S during the Roaring 20s derived its name from the area around the building. What was that phrase?
Answer: idlichutney, kaptchoco, chotavakil, raji, thats and dandilsa all get it right. It’s the FlatIron Building in NYC named because the triangular lot it was built on that resembled, well, a flat iron. The fad phrase in question is 23Skidoo, which refers to getting out while the going’s good.