Cheryl Cole, 33, and boyfriend Liam Payne, 23, just welcomed a baby boy, Bear, in March, but the family won't be making a home in Cole's current residence.

The former pop star and X Factor judge has listed her ultramodern property in Hertfordshire, England for $6.5 million with Statons Barnet Lettings.

The 8,000-square-foot house, known as Brickfields, was designed by Anita Kohn of the U.K. firm Living in Space and her daughter, designer Claudia Afshar.

RELATED: PHOTOS: Inside Beverly Hills' Most Expensive Home, on the Market for $100 Million

"Everything in the house was custom made and designed beautifully," Afshar tells PEOPLE. The "gated entrance set on the oldest roman road in the U.K," and extensive eco-friendly features (smart heating, rainwater recycling, solar panels) make the house "a perfect lifestyle environment for any celebrity."

WATCH THIS: Ellen DeGeneres Lists Her Stunning Santa Barbara Estate For $45 Million

As for why Cole is giving up the unique estate, Afshar says, "She loved the property, but her partner [One Direction's Liam Payne] owns a residence in South London, so it was more about her moving to start a life together as a family. Adding, she "was sorry to leave this special home."

RELATED: Sting and Trudie Styler List Their Stunning New York City Penthouse for $56 Million

The unique estate is comprised of a brick-and-wood cylindrical structure, known as "the kiln," attached to a cantilevered volume of brick over glass. It has won several awards for its design, including the United Kingdom Property Awards 2014 -2015 and Best Property Single Unit UK 2014-2015.

The six-bedroom, six-bath home also features an indoor pool, movie theater, steam room, gym and a hot tub on a hidden roof terrace.