Interested in Gilded Age history? This ornate, columned Upper West Side mansion, which just hit the market for $22.5 million, has it in spades. Steel magnate Charles Schwab lived in the ornate mansion on 74th Street near Riverside Drive from 1914 to 1917; it was later used as the "scandalous love nest" for the mistress of industrialist George Gould. According to the Post, it's divided into an owner's triplex and four large rental apartments (one of which recently asked $8,000/month), but can be delivered vacant. The house totals about 10,000 square feet and has massive bay windows, original wood detailing, a sumptuous staircase, and Juliet balconies galore. Oh, and eight bedrooms, 10 baths, four terraces, a rooftop hot tub, and park views. Aren't single-family mansion conversions all the rage these days?