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The 10 Most Valuable Mansions in New York City

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The number-lovers at PropertyShark have passed along a treat for an otherwise slow summer day: data! The Pshark team combed through property tax figures to come up with a list of the most valuable single-family homes in NYC, based on city assessments. Not surprisingly, the Upper East Side dominates?though a few notable Upper East Siders are missing. 4 East 80th Street, currently on the market for $90 million, doesn't even make the top 20. (It was last valued at just $19.4 million.) 973 Fifth Avenue, new to market at $49 million, comes in at 15th place, with an assessed value of $23.8 million. Of course, the market value calculated by the city will often be much lower than what a buyer will really pay for the property. Much, much lower. Here now, without further ado, let's count down the top 10.

10) 601 Park Avenue
Market Value: $25 million
Last Sale Price: $31,789,500 in 2008
Vitals: 9,400 square feet
The skinny: 601 Park is at the bottom of the list in both size and estimated market value. Before it sold in 2008, it was asking $35 million, a price it didn't quite get. But it still sold for a good bit more than its assessed value.

9) 4 East 75th Street
Market Value:
$27.2 million
Last Sale Price: $53 million in 2006
Vitals: 21,700 square feet
The skinny: Investor J. Christopher Flowers broke records when he bought this place a few years back. Then he cleaned up the limestone facade in the hope of making more on the flip.

8) 9 East 71st Street
Market Value:
$30.1 million
Last Sale Price: Unknown
Vitals: 18,814 square feet
The skinny: This place last sold in 1989, but it had some significant facade repairs in 2002.

7) 15 East 81st Street
Market Value:
$31 million
Last Sale Price: Unknown
Vitals: 16,233 square feet
The skinny: This townhouse owner (a corporation) is committed: the place has been under the same ownership since 1984.

6) 5 East 68th Street
Market Value:
$31.9 million
Last Sale Price: Unknown
Vitals: 19,746 square feet
The skinny: See that flag outside? This place belongs to Indonesia.

5) 36 East 67th Street
Market Value:
$32.6 million
Asking: Not on the market; last sold in 2003 for $19.75 million
Vitals: 16,235 square feet
The skinny: This might be the only East 67th Street house that hasn't recently been a fixer-upper.

4) 14 East 67th Street
Market Value:
$34 million
Last Sale Price: $49 million in 2008
Vitals: 18,240 square feet
The skinny: When this house last sold, it was the fourth biggest sale of the last decade. And it doesn't just make the record books?it's also got quite the interesting (by which we mean seedy) history. It used to be the Guccione mansion, and it's now owned by the Falcones, who've made some changes to the place.

3) 690 Park Avenue
Market Value:
$35.5 million
Last Sale Price: Unknown
Vitals: 19,580 square feet
The skinny: Here's another house that belongs to a country. A round of applause for Italy, if you please.

2) 34 East 63rd Street
Market Value:
$35.5 million
Last Sale Price: Unknown
Vitals: 16,103 square feet
The skinny: This property doesn't appear to have sold since 1995. Assuming it's had some upgrades since then, now might be the time!

1) 48 East 92nd Street
Market Value:
$43.1 million
Last Sale Price: $24.5 million in 2004
Vitals: 14,414 square feet
The skinny: Before this house last traded hands in 2004, it belonged to Woody Allen. The current owner is an LLC.