Winnetka’s Windsor House sells for record-breaking $31 Million—who’s moving in?

The Windsor House in Winnetka has long been one of those properties locals speak about in almost mythical terms. It was built in 1928 for Popular Mechanics publisher Henry H. Windsor Jr. and his wife, opera singer Louise Hunter Windsor. The French Renaissance Revival estate was never just another mansion on the lake. Its iron gates, manicured gardens, and stately limestone façade always hinted at the kind of grandeur that rarely comes up for sale. In early September, that legacy grew even larger.

On Wednesday, Sept. 3, the 22-room lakefront estate changed hands for $31.3 million, setting a record for the most expensive resale of a single home in Chicago-area history. The sellers, retired Goldman Sachs banker Muneer Satter and his wife, Kristen Hertel, spent two decades and tens of millions restoring the property into something closer to a private resort than a residence.

Satter and Hertel purchased the mansion in 2002 for $9.5 million and subsequently added a neighboring parcel in 2013 for $4.1 million, expanding their property to 2.3 acres with 223 feet of private beachfront. Along the way, they poured between $65 million and $72 million into transforming the estate, according to listing agent Jena Radnay of @properties Christie’s International Real Estate.

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The results of that investment are undeniable. Beyond the mansion’s sweeping two-story living room and restored murals, the grounds include a boathouse, a commercial-grade boardwalk, an infinity pool with spa, manicured hedges, a pergola, and even a heated motor court that can hold ten cars. It is, by any measure, a showpiece, equal parts historic home and lakefront playground.

Despite the scale of the sale, the buyer remains a mystery. Records show the purchase was made through a land trust, with no beneficiary disclosed. It’s a reminder that in the uppermost tier of real estate, privacy is often as valuable as the property itself.

For Radnay, who has built her career marketing North Shore mansions, this deal represented a career high. “There is nothing like this mansion,” she said, pointing to its one-of-a-kind grounds and the years of meticulous care poured into it. “It was a seamless transition to the next generational owner, who believed in the same, one-of-a-kind beauty.”

The $31.3 million figure easily outpaces other headline-grabbing sales in the region. Billionaire Ken Griffin’s $58.8 million purchase of multiple floors at 9 W. Walton, Chicago, in 2017 technically involved higher totals, but none of those transactions represented a completed, move-in-ready residence. Likewise, Justin Ishbia’s $77.7 million Winnetka project involved demolishing three existing houses to build new ones. The Windsor House sale stands alone as a finished, historic home purchased at a record-setting price.

The sale adds to a string of eye-catching deals in Winnetka’s high-end market. In recent months, multiple lakefront properties in the village have sold for eight-figure prices, contributing to a surge in top-end transactions across the North Shore. In fact, five of the six most expensive sales in the Chicago area so far in 2025 have been Winnetka estates.

Still, for all the record-setting and the eye-popping sums, Windsor House’s significance goes beyond numbers. It remains a rare example of a historic estate that has been carefully preserved and elevated for the 21st century. Whoever the mystery buyers may be, they’re not just acquiring square footage and lakefront views; they’re inheriting a piece of Chicago’s architectural and cultural history.