Apartments for very wealthy New Yorkers have remained mostly within the city’s smallest borough. Until now.

The record price for a Brooklyn home broke the $15 million threshold this summer, and by now it’s widely accepted that New York’s outer boroughs are not much of a bargain, growing further out of reach for the aspiring homeowner. The rush of new construction in gentrifying neighborhoods has pushed up the price of land, and that’s caused construction costs to rise, too. Eventually, to make a profit, developers have to build luxury buildings, according to Jonathan Miller, the president of New York appraiser Miller Samuel.

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