On our way back from the doctor last week, we stopped to take in this beautiful Italianate mansion at 23 Park Avenue (aka 101 East 35th Street). We also managed to scribble down what’s engraved on the plaque on the side of the building which provides a little background on the 25,000-square-foot building:

This McKim,Mead and White residence, completed c. 1891, was commissioned by James Hampden Robb (1846-1911), former cotton broker, New York State Assemblyman and Senator (1882-85), and Commissioner of the Parks Department (1887-90). Designed in the Italian Renaissance style by Stanford White, the facade features Roman brick and terra-cotta ornament ona brownstone base. In 1923, the interior was modified to accommodate the Advertising Club of New York, which occupied the site until 1977. It is now a cooperative residence.

Further research suggests that there are 15 co-op apartments though we were unable to find any information about recent sales prices.
23 Park Avenue Profile [City Realty] GMAP P*Shark