sentences:  A parade of mansions were commissioned along Fifth Avenue to what became known as “Millionaires Row” for some of the wealthiest and most celebrated families in Pittsburgh, such as the Mellons, the Benedums, and the Fricks.In 1909, one of the most impressive mansions built was the 65-room Richard Beatty Mellon House on the of land bordering Fifth Avenue, Shady Avenue and Beechwood Boulevard on what is now known as Mellon Park.Richard Beatty Mellon and his wife Jennie King Mellon raised two children, Sarah Cordelia King Mellon and Richard King Mellon.