If you wanted your house to convey the message “I’m rich ppttttttthhht,” then Paul Irwin was the architect to hire. This Renaissance palace uses every trick in the architect’s vocabulary to tell the world that a millionaire lives here, and he is richer than you are. It was built in 1914 on the Fifth Avenue Millionaires’ Row, where, although it is not the biggest of the surviving mansions, it somehow manages to look like the most expensive.