Solidcore Founder Anne Mahlum Unveils Plans for Massive 10-Bedroom Dream Home as She Prepares for ‘More Babies’

Solidcore founder Anne Mahlum is thinking big for her next home—a sprawling, 10-bedroom property designed around entertaining, family life, and her love of staying in.

The fitness entrepreneur, 46, shared an AI-generated rendering of the planned residence on Instagram, revealing that it will span between 12,000 and 13,000 square feet.

Explaining the inspiration behind the project, Mahlum told her more than 100,000 followers that she and her husband, Brett, want a home that reflects how they enjoy spending their time.

"Brett and I love to be home. We’ve built an amazing life where our home is the centerpiece of our daily life. Neither one of us have wanderlust at this stage," she wrote.

Their plans also account for a busy social calendar—and hopes of growing their family.

"We like having a routine, eating at home, and we love hosting family and friends! I have girls over pretty much every day to play volleyball and between October-May, we have guests at least twice a month. We absolutely love when our place is full of people we love playing VB, games, swimming, sauna’ing, cooking and connecting. Oh, and we’re planning on more babies," she added.

Mahlum acknowledged that bringing the vision to life will require a substantial investment. However, she explained that the project's value to her extends beyond its potential financial return.

"This house is going to cost us a pretty penny and any financial expert would tell you that putting money into a primary home is not the place to get returns. But, this decision is not about maximizing every dollar we have and that’s where I see people get it wrong. They won’t spend on the things that really contribute to their happiness. They get too obsessed with just growing their pot of money, but I’ve been uber clear that I don’t want to be a billionaire," she said.

As for the interiors, Mahlum envisions colorful spaces with mosaic tiles, statement bathrooms, rounded arches, and plenty of room for everyone to gather.

"I’m so excited to get to put my creative energy into this project. Think color, mosaic tiles, bold bathrooms, wall and window treatments, rounded arches and large communal areas. If you have built your dream home, please share tips or things you absolutely love about your house," she wrote.

Her plans for a new home come nearly a year after she put her New York City loft on the market for $3.1 million—12 years after she first launched the fitness empire that helped her to amass a $100 million fortune.

She purchased the Chelsea unit in 2021 for $2.75 million, according to property records. Then, in 2025, she has decided to hand over the keys to a new owner in a move she described as "bittersweet."

The fitness mogul, who founded her business in 2013 while she was living in Washington, DC, has owned multiple properties across the U.S., including another property in New York, as well as homes in Miami.

She would use her three-bedroom loft whenever she was in the Big Apple for work, according to its listing agents, Scott Francis and Ashley Brooke with Serhant.

"Selling this place is bittersweet," Mahlum said at the time. "I have such fond memories in this quintessential New York apartment with the exposed brick, tin ceilings and many original pre-war features."

Mahlum founded Pilates-inspired Solidcore in 2013 with just $175,000, risking everything for its success.

"I invested all of my $175,000 in personal savings to launch Solidcore and bootstrapped the company after that," she revealed in an interview with the U.S. Chamber of Commerce. "I had no assets, and I didn't think I could get a bank loan or raise venture capital.

"I used the startup money to pay for a lease for my first fitness studio in Washington, DC, and then I hired and trained instructors, leased gym equipment, and began marketing the business. I chose DC since it was a market with little competition from other fitness boutiques."

Fortunately, the business took off, expanding to Philadelphia and Atlanta because they were markets that she "was familiar with," she explained.

Solidcore grew to become one of the most successful boutique fitness companies in the country, opening more than 115 locations around the U.S., including five in New York City, with another soon set to open on the Upper West Side.

During her time at the forefront of the business, Mahlum built up a core following of dedicated clients, including high-profile influencers, fitness experts, and celebrities—from former first lady Michelle Obama and President Donald Trump's daughter Ivanka to actress Sydney Sweeney.

By 2023, Mahlum was ready to begin new adventures and sold the fitness company for a staggering $88.4 million.

"Selling Solidcore was joyous and part of the plan all along. I’m really good at the beginning stages of starting a business—branding, building a team and a community, fundraising," Mahlum told CNBC at the time of the sale.

"Once the business gets to a place where it’s really functioning and needs to go radically deeper, there’s less risk and excitement. Less work in the areas I’m really good at.

"I think a lot of startup founders screw up there. If you tried to throw me into a company like Tesla, I’d be like, 'This is a horrible idea.' I have no idea how to run a company of that size."

Today, she is estimated to have a net worth of around $100 million—and her former business was valued at between $600 million and $700 million as recently as September 2024.