New York 'mansions in the sky' highlight wealth inequality
The famous New York skyline is becoming dotted with a new breed of skyscraper, high-rise buildings, full of luxury apartments for the super-rich.
Some properties are selling for more than $100m (£64m) - a real estate record for Manhattan.
Wealth inequality is set to be a big issue ahead of next year's presidential election, and, as Nick Bryant reports, these new buildings have become a potent symbol of that debate.