The gilded age has returned to the Upper East Side — from Russia, with cash.

Plans to join three historic townhouses on East 75th Street will create a mega-mansion of 31,500 square feet, the largest single-family home in Manhattan, according to architectural plans exclusively obtained by The Post.

Russian-Israeli billionaire Roman Abramovich, a close friend of Russian President Vladimir Putin, began acquiring townhouses on the stretch of 75th Street between Fifth Avenue and Madison Avenue in 2014 to build his urban castle.

One design expert said the renovation price tag could reach $100 million, on top of the $90 million already paid for the property purchases.

Last month, Abramovich, 51, the owner of England’s Chelsea Football Club, transferred the combined properties at 9, 11 and 13 East 75th St. to his ex-wife, Dasha Zhukova, for $74 million, public records show. A fourth townhouse — 15 East 75th St. — was also transferred to Zhukova, a 37-year-old socialite and art collector, for an additional $16.5 million, although it is no longer included in the plans for the mega-mansion.

Architectural renderings for the opulent six-story home, designed by New York architect Stephen Wang and approved by the Landmarks Preservation Commission in November, include 12 bathrooms; an indoor/outdoor pool; a sculpture garden, and an art gallery atrium that soars through two floors of the sprawling home.

The home promises to dwarf both the mayor’s residence at Gracie Mansion and the governor’s official home in Albany, which are each 20,000-square-feet. It will eclipse Michael Jackson’s 12,598-square-foot Neverland ranch, and Prince’s 10,000-square-foot Paisley Park estate near Minneapolis.

Blueprints show two elevators, a wine cellar, a butler’s pantry, two kitchens and a sauna. The entire sixth floor is devoted to a roof garden and outdoor dining area.

The back of the property is dominated by a towering, four-story glass panel to be constructed out of “curtain-wall glass,” with bronze metalwork holding it together, overlooking a 30-foot-deep Japanese-style rock garden. The glass is bullet-proof and typically used in the construction of skyscrapers, an architect who viewed the plans told The Post.

The home’s grand, theatrical staircases are 17 feet wide, according to the drawings. Staircases in even the most palatial homes do not typically go over eight feet in width, an interior designer told The Post.

“New York residential design hasn’t seen this kind of luxury since the old, sprawling family mansions of Andrew Carnegie and Otto Kahn,” said Sasha Josipovicz, the international editor of “Objekt,” a design and architecture magazine.

“It’s a perfect balance of form and function,” he said, after reviewing the plans for the three combined homes. “It’s built like a palace but there are also a lot of intimate, family spaces.”

At more than 4,500-square feet, the fourth floor is almost entirely devoted to the ensuite master bedroom and five walk-in closets. It also includes a large “working study” room and a “flexible room.”

The fifth-floor features four other bedrooms, each with its own bathroom, and two studies and playrooms.

This megamansion planned at 9 E. 75th St. would combine three brownstones. A few of the highlights: A spiral staircase (1) climbs 4 stories to a garden that spans the roof. Or take the elevator. The 4th-floor master bedroom (2) has an equally huge en suite bathroom and so many closets. A two-story art room (3) has a library attached on the lower floor and a media room overlooking it. A servant's entrance and elevator on one side of the building keeps the help separate. (4) Massive windows on the rear of the house overlook the multilevel yard. (5) Past the foyer and main staircase is an indoor pool that opens to the yard. (6) Among the many mixed-use living spaces suggested in the plan is a ground-floor meeting room. (7) In the basement (8), which is of course predominantly storage, there's also space for the requisite wine cellar. Ad Up Next Close Victim of Brooklyn sucker-punch attack speaks out She never saw it coming. Rasa Barzdukas was grabbing a... 3 View Slideshow Back Continue Share this: Facebook

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All three homes are in the Upper East Side Historic District. One of the houses — 13 East 75th St. — is a Queen Anne-style row house designed by architect William Mowbray and built between 1887 and 1889. Mowbray’s Manhattan firm developed many Victorian homes in Hamilton Terrace, the Harlem neighborhood that surrounded Alexander Hamilton’s estate in the 19th century.

The home dwarfs other mansions in the city, including the Harkness mansion, across East 75th Street, now owned by art dealer Larry Gagosian. The limestone home was built in 1896, and boasts 20,000 square feet of space.

The Zhukova home’s square footage also tops other townhouse conversion projects, such as those by artist Jeff Koons and billionaire Phil Falcone on East 67th Street. Falcone’s renovation of the double-wide mansion once owned by “Penthouse” founder Bob Guccione is expected to top 25,000 square feet. Koons’s joining of 11 and 13 East 67th St. is expected to create a 21,500 square-foot home, public records show.

Abramovich’s property transfer to his ex-wife was publicly registered on Sept. 14, and came three months after he was denied a British residency visa and acquired Israeli citizenship. Last month it emerged that he had been denied Swiss residency in 2016 after Swiss police told immigration authorities they were concerned over “suspicion of money laundering” and Abramovich’s alleged connections to criminal enterprises. A lawyer for the billionaire dismissed the allegations and said he would file a criminal complaint against Swiss authorities.

Zhukova, founder of the Garage Museum of Contemporary Art in Moscow and “Garage Magazine,” last year divorced Abramovich, with whom she has two children.

While work continues on the mansion, Zhukova has been living at a double-wide townhouse on East 64th Street owned by a company tied to Russian aluminum billionaire Oleg Deripaska, who has close ties to Putin.

Last week, federal agents seized the $42.5 million property because it’s owned by a Russian under investigation.

Despite the seizure, Zhukova has been allowed to remain in the property, The Post reported last week.