The richest 1% of New York City residents are living in multimillion-dollar Frankenmansions

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

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 two decades. After connecting the floors in 2009, he grew his home to 12,500 square feet, according to The New York Post. The buildings are within steps of Central Park.

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A $19.75 million pair of townhouses is currently on the market.

A $19.75 million pair of townhouses is currently on the market.

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 them 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. But the Frankenmansion may soon find a new owner — the 15,600-square-foot space went on the market for $19.75 million in 2016, according to the New York Times.

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

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

The star of Sex and the City snatched the two brick townhouses above from the nonprofit United Methodist Women, then fused them together. The organization listed the pair of buildings (which were not connected) for $44 million in 2016, but Parker paid $34.5 million, according to The Real Deal.

The 13,900-square-foot mansion includes nine bedrooms, eight bathrooms, a 2,100-square-foot private garden, and five floors.

Napster co-founder Sean Parker paid $58.5 million for his mega-mansion.

Napster co-founder Sean Parker paid $58.5 million for his mega-mansion.

Sean Parker, the former president of Facebook, owns the three brownstones pictured above. Each building originally contained four apartment units, a grand stairwell, and a rear garden. The interior spaces feature arched doorways and original 19th century fireplaces with marble mantles.

Parker purchased the first building for $20 million in 2010, the second for $16.5 million in May 2016, and the third for a reported $22 million in August 2016. He completed the renovation to connect all three in late 2016.

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Once a factory and showroom, this set of buildings will soon be one Frankenmansion.

Once a factory and showroom, this set of buildings will soon be one Frankenmansion.

Billionaire Jon Stryker is the rumored owner of the three brick buildings above, which NYC-based architecture firm Steven Harris Architects is working to turn into one residence. Curbed reported that Styker was probably the buyer of the $32 million set in 2012. The renovation project underwent an approval process from the city, which approved it in February 2017.

In their former lives, the buildings were an ice cream factory, a Steinway piano showroom, and a garage. The property's facade will stretch 41 feet from end to end.

Madonna's $32 million Frankenmansion has 13 bedrooms.

Madonna's $32 million Frankenmansion has 13 bedrooms.

In 2009, Madonna bought three connected townhouses on Manhattan's Upper East Side. The $32 million mansion features 13 bedrooms, a dance studio, multiple dining rooms, a 3,000-square-foot garden, two garages, an elevator, and a private gym, according to Curbed.

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Roman Abramovich is working to connect a trio of townhouses worth $78 million.

Roman Abramovich is working to connect a trio of townhouses worth $78 million.

In late 2016, Russian billionaire Roman Abramovich got approval to connect three townhouses on the Upper East Side, according to 6sqft. He purchased the buildings in 2015 for a reported $78 million.

The facades will be preserved, and the center house will become the mansion's main entrance after construction is complete. The interiors will be completely renovated, and the backyard will feature a private garden.

A pair of limestone townhouses is listed for $75 million.

A pair of limestone townhouses is listed for $75 million.

Owned by the billionaire Safra family, the two limestone townhouses above were listed for sale in 2015 as a trio with the building on the far right. The asking price was $120 million, but in 2016, the owners asked $75 million for just the pair, which sold in early 2017 and will likely be combined, according to Curbed.

A total of 25,641 square feet, the soon-to-be Frankenmansion would feature 18 bedrooms.

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Musician Michael Feinstein has a $17.9 million brownstone duo.

Musician Michael Feinstein has a $17.9 million brownstone duo.

Feinstein bought the townhome on the left for $3 million in 2004, according to The New York Times. A year later, the one next door went up for sale for $3.825 million, and Feinstein purchased, gutted, and renovated it to connect the two.

The finished product features 18 rooms, twin staircases, seven bathrooms, two powder rooms, eight fireplaces, a 25-foot-wide backyard, and two pagodas, which serve as outdoor living and dining areas. He put the mansion on the market for $17.9 million in 2013, but later decided to keep it.

Dexter Goei, CEO of the telecoms company Altice, plans to combine these two townhouses in Manhattan's Greenwich Village neighborhood.

Dexter Goei, CEO of the telecoms company Altice, plans to combine these two townhouses in Manhattan's Greenwich Village neighborhood.

In June 2016, Altice CEO Dexter Goei bought two townhouses in Manhattan's Greenwich Village for $31 million, according to the Wall Street Journal.

The Real Deal reported in October that converting them into one mega-mansion is expected to cost $1.3 million. The renovation will be led by architecture firm Arcologia.

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Artist Jeff Koons melded these two townhomes east of Central Park.

Artist Jeff Koons melded these two townhomes east of Central Park.

Jeff Koons, the artist known for his giant sculptures of balloon animals, purchased the townhomes pictured above for a total of $32 million in 2009, according to Curbed.

A year later, he applied to NYC's Department of Buildings to combine them into a 21,500-square-foot megamansion, but the request was denied. In 2013, he submitted a revised proposal, and the renovation started soon after.

Lauren Bush purchased a trio of West Village townhomes, combined by previous owner and renowned photographer Annie Leibovitz.

Lauren Bush purchased a trio of West Village townhomes, combined by previous owner and renowned photographer Annie Leibovitz.

Lauren Bush, granddaughter of former President George H.W. Bush, bought a trio of townhouses for $28.5 million in 2014, along with her husband David Lauren, the New York Post reported.

Renowned photographer Annie Leibovitz was the previous owner. She bought the first two townhouses in 2002 for $4.2 million. A year later, she purchased the neighboring one on the corner for $1.9 million, and combined the three.

Together, the compound stretches 10,200 square feet and features seven bedrooms, 5.5 bathrooms, 13 fireplaces, and a private gated garden.

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