$3M town houses the new Brooklyn

There’s a new Gold Coast on the East River — and even the Gowanus Canal.

Townhouse sales of more than $3 million in Brownstone Brooklyn and North Brooklyn increased 579 percent in the past five years, a report has found.

“Three million dollars is the new threshold for a Brooklyn town house,” said Aleksandra Stepanovic, managing director of Ideal Properties Group, which prepared the report.

Inventory is also on the rise, which will sustain the “explosive” trend, she predicted. And resale prices are extraordinary.

Last month, Michelle Williams sold the Boerum Hill town house she and the late “Dark Knight” star Heath Ledger shared for $8.8 million — $1.3 million above its asking price. That was also more than double the $3.6 million they paid in 2005.

Last year, 98 town houses sold for $3 millionplus in North Brooklyn and Brownstone Brooklyn, including one in Gowanus, which had its first $3 millionplus sale.

The $3 millionplus deals accounted for 9.5 percent of the 1,035 town houses that sold last year.

In 2013, only 47 town houses sold for more than $3 million.

In 2009, a mere 11 town houses sold for more than $3 million, according to the report. That number was just 1.4 percent of the 787 brownstones that sold in 2009.

Brooklyn Heights, Cobble Hill and Park Slope were the pioneering neighborhoods in the $3 millionplus category followed by Boerum Hill, Downtown Brooklyn, Fort Greene and Carroll Gardens. Prospect Heights, Greenpoint and Williamsburg crossed the $3 million threshold in 2013.

The report covered Brownstone Brooklyn, which includes Boerum Hill, Brooklyn Heights, Carroll Gardens, Clinton Hill, Cobble Hill, Park Slope, Prospect Heights and parts of Downtown, DUMBO, Fort Greene, Gowanus, Red Hook and Vinegar Hill. North Brooklyn is comprised of Williamsburg, the Navy Yard and Greenpoint. Jennifer Gould Keil