Japanese billionaire asks $50 million for enormous Manhattan mansion with secret passageways

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Less than a block from Central Park, the townhouse mansion is built entirely of limestone.

Less than a block from Central Park, the townhouse mansion is built entirely of limestone.
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Erected in 1898, a massive addition was completed in the 1920s and other updates were made in the late '90s. Historical details like the gorgeous mansard roof have been preserved over the years.

Erected in 1898, a massive addition was completed in the 1920s and other updates were made in the late '90s. Historical details like the gorgeous mansard roof have been preserved over the years.
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Inside, the entrance parlor has immaculate and original 12 feet high ceilings.

Inside, the entrance parlor has immaculate and original 12 feet high ceilings.

The home has several secret passageways. One links the library to a hidden card room while another — obscured by a coat closet — leads to the basement.

The home has several secret passageways. One links the library to a hidden card room while another — obscured by a coat closet — leads to the basement.
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The former owner was professional art collector Sam Salz. With two gallery spaces, works by Renoir, Monet, and Cezanne have graced the walls.

The former owner was professional art collector Sam Salz. With two gallery spaces, works by Renoir, Monet, and Cezanne have graced the walls.

The 13 feet high parlor ceilings, which include this coffered rosette design, are among the home's historical artifacts.

The 13 feet high parlor ceilings, which include this coffered rosette design, are among the home's historical artifacts.
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A beautiful original staircase connects six floors.

A beautiful original staircase connects six floors.

There are two kitchens in the home, with one reserved exclusively for catering. The house is currently set up with two staff rooms.

There are two kitchens in the home, with one reserved exclusively for catering. The house is currently set up with two staff rooms.
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The oak wood paneling in the dining room is original.

The oak wood paneling in the dining room is original.

A bright and sunny solarium provides an ideal place to relax with views of the backyard greenery.

A bright and sunny solarium provides an ideal place to relax with views of the backyard greenery.
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You can even see Central Park from the top of the house.

You can even see Central Park from the top of the house.