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The co-founder of fashion house Calvin Klein has listed his massive equestrian farm estate in New York for $100million.  

Photos of the jaw-dropping property, built by Barry K. Schwartz and perfected over the last four decades, showcase the ultimate two-story library; the sensational façade of the four-level colonial plantation-style manor; and stunning views over the property's enormous 740-acre grounds. 

Since 1979, Schwartz and his wife Sheryl have created Stonewall Farm, an estate of refined elegance and exceptional taste, in Westchester County. 

Schwartz famously advanced Mr. Klein $10,000 in 1968 to create samples to start a fashion line. 

The two men, friends since the age of five, built Calvin Klein, Inc. into a multi-billion-dollar entity with Mr. Schwartz as CEO and Mr. Klein the company figurehead and creative visionary.

The co-founder of legendary fashion house Calvin Klein, Barry K. Schwartz, has listed his mammoth 740-acre, equestrian farm-style mansion found tucked away in New York's Westchester County for a staggering $100million 

The 'once-in-a-lifetime' property - which is a  four-level colonial plantation-style manor that has been aesthetically perfected for more than four decades - houses a stunning arched glass ceiling that is is perfect for letting sunlight in and just a few steps away from a bluestone patio

The interior design of the $100million equine mansion is welcoming to homeowners and guests who want to relax a comfortable, informal drawing room that livens up the overall beige color-scheme with splashes of red, scarlet and a muted pink 

When Mr. and Mrs. Schwartz decided that Stonewall Farm would be their primary residence, they replaced the original farmhouse with a 24,000-square-foot home evoking the traditional horse farms of Kentucky, which was completed in 2004. 

The estate currently supports a working cattle ranch, hay fields and an original stone spring house tapping into an aquifer and supplying hundreds of gallons of water a day. 

 The property also has a 40-stall barn for horses, as well as two 24-stall broodmare barns, a turf racetrack, round pends and paddocks.   

The equine-style design motif travels well beyond the multi-acre mansion's impressive barns and subtly into the interior design, like this remarkable his-and-hers bathroom facility that emphasizes dark wooden furnishings and ample walking room 

Also found inside the fantastic bathroom is an indoor jacuzzi (pictured) that was outfitted with dark wood panelling and a miniature garden near the French windows to bring about the ultimate relaxing experience for homeowners 

Stonewall Farm, an estate of refined elegance designed by the Scwartz in 1979, has nestled within its walls a two-story library that highlights interesting quirks like a black spiral staircase that leads to the second landing and a row of glass French doors that allow homeowners to marvel at the beautiful space  

The property's shining glory in undoubtedly the equestrian facilities that have lodged award-winning thoroughbred racehorses. Horses receive the upmost treatment from the facilities, with features that include a 40-stall barn for horses, two 24-stall broodmare barns, a turf racetrack, round pends and paddocks

Auxiliary housing includes eight staff residences, a guest house and caretaker's residence. It is one of the largest privately owned homes in the county. 

A 2,200-bottle wine cellar is also found on the property.  

The home's exterior is topped with a slate roof repurposed from Yale Divinity School and a sunroom wit high, arched glass ceilings that leads onto a bluestone patio, NY Curbed reports. 

Exercise is no problem for homeowners of the mansion, with a 4,000-square-foot pavilion that holds a gym, a 60-foot pool near a gorgeous fireplace and a sauna. 

Outside the home, the expansive landscape was designed by architect Edmund D. Hollander. 

Key differences, like a dark hardwood floor, set the mega-mansion’s master suite apart from other rooms, but the Schwartz appeared follow theme and designed their bedroom with the same color-scheme and stone fireplace found in the drawing room 

This lengthy indoor pool is found next to a pergola walkway built by landscape architect Edmund D. Hollander, who also added in a French garden with floral hedges outside the home and a Japanese garden equipped with a koi pond and a butterfly house

Stonewall Farm's kitchen (pictured) takes a distinct pivot from the mansion's overall beige aesthetic, instead leaning into a pristine, all-white color palette that only deviate for stainless steel appliances and white marble countertop 

Hollander added a French garden with floral hedges, a pergola walkway near an indoor pool and a Japanese garden equipped with a koi pond and a butterfly house.

Ilija Pavlovic, president and CEO of Christie's International Real Estate Westchester and Hudson Valley, said: 'There are few properties in the world which qualify as a 'once in a generation' property. 

'Stonewall Farm definitely belongs to this esteemed category of rare estates. We are very excited for the opportunity to present to our customers for the first time in history this most beautiful 740-acre estate, less than an hour's drive from Manhattan.'

Kathleen Coumou of Christie's International Real Estate was equally thrilled to have the magnificent listing on their books.

Guests strolling through Stonewall Farm for the first time will be taken aback by the sheer opulence shown inside the mansion's hallways (pictured). This particular section of the home includes a sleek chandelier, an attention to marble finishing and French doors that lead to the extraordinary yard

Ilija Pavlovic: 'Stonewall Farm definitely belongs to this esteemed category of rare estates. We are very excited for the opportunity to present to our customers for the first time in history this most beautiful 740-acre estate, less than an hour's drive from Manhattan'

'Stonewall Farm is well-known and respected globally among horse racing enthusiasts,' she said.

'We look forward to promoting this rare opportunity to equestrian communities of all disciplines and also introducing it to the larger community of international buyers looking for significant acreage, architectural design and provenance so close to New York City.' 

More striking shots depict Stonewall Farm's top-of-the-range equestrian facilities and the land dedicated to raising championship thoroughbred racehorses.

The 'once-in-a-lifetime' property is currently on the market for $100milllion with Christies International Real Estate.