85 to 89 Jane St. factory

When an apartment or penthouse isn’t big enough for wealthy New Yorkers, they get creative.

In recent years, several have combined multiple townhouses or building floors to create supersized homes — or Frankenmansions, as New York magazine’s S. Jhoanna Robledo calls them.

To construct these Frankenmansions, some prospective buyers purchase multiple buildings at once, while others approach their neighbors to offer multimillion-dollar buyouts. (In either scenario, they need the city’s approval before combining properties.)

Check out these 12 Manhattan Frankenmansions owned by big names — including Madonna and Sarah Jessica Parker — outlined below in red.

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Former New York City Mayor Michael Bloomberg’s Frankenmansion is nearly complete.

Bloomberg has bought five of the six apartment units in the building next to his 7,500-square-foot townhouse over the last three decades. After connecting four units in 2009, he grew his home to 12,500 square feet, according to the New York Post. The buildings are steps from Central Park.

A 25-bedroom pair of townhouses sold for $18 million.

The Missionary Sisters of the Immaculate Heart of Mary, an NYC-based convent of nuns, acquired the townhome on the right in 1948. Four years later, the group bought the one next door and connected the space via a doorway on each floor.

Throughout the years, the order has rented some of the complex’s 25 bedrooms to other congregations or young women in need. The 15,600-square-foot space went on the market for $19.75 million in June 2016, according to the New York Times. And according to Streeteasy, it sold to an unknown buyer two months later for $18.8 million.

Sarah Jessica Parker lives in a pair of twin townhouses worth $34.5 million.

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