Greenwich Village megamansions are en vogue

Forget The Dakota, the new hot thing to do if you're New York City royalty is to buy a building or two and transform it into a mansion. If you want to follow in the footsteps of Sean Parker and Sarah Jessica Parker, the neighborhood to hit up is Greenwich Village, where a number of these "Frankenmansions" are being planned.

The most recent of these is a farmhouse on land once owned by John Jacob Astor at 21 West 10th Street. The property sold last year to an entity known as 21 West Townhouse LLC, which paid $31 million for it. The red brick, Federal-style property is configured as 10 rental apartments — but the new owner plans to convert the historic building into a single-family mansion, according to a permit application filed with the city.

In January, another opportunity hit the market: two adjacent Greenwich Village townhouses at 133 and 135 West 13th Street with megamansion potential and an asking price of $15.65 million.

To see the sites of some of Greenwich Village's future "Frankenmansions," watch the video above.