The Gilded Age mansions that once stood along 5th Avenue — nicknamed Millionaire’s Row — have mostly met the wrecking ball. But the Villard Houses remain remarkably preserved since their construction in 1884. The famed architecture firm McKim, Mead and White designed this visionary six-house complex for Henry Villard, a railroad magnate whose empire began to crumble as construction wrapped. Today — after many changes in ownership and a landmark designation — the buildings stand as the entrance to the Lotte Palace Hotel. The hotel has just offered several rooms inside the south wing of the property, the former home of Villard himself, up for lease, offering a rare look into the lavish interior that’s hardly changed since it was designed over 100 years ago.