When it comes to luxury real estate, America's wealthiest citizens spare no expense. From Gilded Age palaces to modern mega-mansions, these estates feature amenities most of us can only dream of — ...

While most Americans are drowning in debt or struggling with rising housing costs, the world’s tech billionaires are living in luxury mega-mansions that would make the Gilded Age robber barons blush.

Add Yahoo as a preferred source to see more of our stories on Google. In the richest ZIP code in the U.S., condos dominate the skyline. But if you squint hard enough at the new construction across ...