Duluth’s Famous “Mushroom House” Just Hit the Market and We Are Completely Obsessed With It

Some homes need no introduction. The Duluth Mushroom House is one of them.

Known around town for over 50 years as the “Mushroom House” — or sometimes the “Flintstone House” — 1401 Mississippi Avenue is a triple-dome architectural icon that has been turning heads in the Kenwood neighborhood since 1970. It just hit the market for the first time since 2021, went viral almost immediately after listing, and is listed at $369,999.

We are completely obsessed with it, and we think you will be too.

📍 1401 Mississippi Ave, Duluth, MN 55811
💰 $369,999
📐 2,800 sq ft | 0.60-acre wooded lot
🛏 5 bedrooms | 3 bathrooms
📅 Built 1970 | Foam-shell construction
🍄 Known locally as “The Mushroom House” and “The Flintstone House”
🔥 Wood-burning fireplace | Sunken living room
🚗 Two-stall attached garage with loft storage
🪟 All 16 windows replaced in 2024

A Duluth Legend for Over 50 Years

The listing puts it perfectly: “There are homes that shelter people, and there are homes that reflect them. This home is the second kind.” Designed by Colorado architect Stan Nord Connolly and developed by George Hovland, the Mushroom House was built using an innovative foam-shell construction method — a process not entirely unlike the Airform gunite method used by Wallace Neff on his own iconic dome house in Pasadena. Great minds, apparently, think in domes.

The triple-dome roofline, stalagmite-shaped chimney, and Bat Cave-style garage drew so many curious visitors over the decades that the family had to put up “no trespassing” signs. It is tucked into a private, wooded half-acre lot in Kenwood, within walking distance of the University of Minnesota Duluth and the College of St. Scholastica — hidden away, yet unmistakably there.

Life Inside the Mushroom

Inside, the home unfolds with curved walls, soaring dome ceilings, and spaces that feel more sculpted than built. The main level has a sunken living room with a built-in sofa and a dramatic wall of seven-foot patio doors opening to a wraparound deck overlooking the trees. The arched kitchen includes a breakfast bar and carries the organic geometry throughout. The primary bedroom has vaulted ceilings and epoxy flooring.

Head down to the walk-out lower level and there is a spacious great room with beamed ceilings, a wood-burning fireplace, and patio access to the wooded backyard, plus three additional bedrooms, a full bath, a half bath, and laundry. All 16 windows were replaced in 2024. A two-stall attached garage with loft storage rounds it out.

Five bedrooms. Three baths. 2,800 square feet. A Duluth landmark. For $369,999.

Already Viral, Already Beloved

This home went viral the moment it listed — and it is easy to see why. There is simply nothing else like it in Minnesota, or really anywhere. If you love the kind of home that stops you mid-scroll, the Mushroom House is it. It has been a local landmark for over half a century and now it is looking for its next chapter.

We hope whoever buys it leaves the “no trespassing” signs up. This one deserves its mystique.

Frequently Asked Questions

What is the Duluth Mushroom House?

The Duluth Mushroom House is a triple-dome home at 1401 Mississippi Avenue in Duluth, Minnesota, known locally as the “Mushroom House” or “Flintstone House.” It was designed by architect Stan Nord Connolly and built in 1970 using an innovative foam-shell construction method.

How much is the Duluth Mushroom House listed for?

The Duluth Mushroom House is currently listed for $369,999.

What is foam-shell construction?

Foam-shell construction is a building method where a foam form is used to create curved, dome-like structures. It allows for organic, non-rectangular shapes that would be difficult to achieve with traditional framing methods.

Where is the Duluth Mushroom House located?

It is located at 1401 Mississippi Avenue in the Kenwood neighborhood of Duluth, Minnesota — within walking distance of the University of Minnesota Duluth and the College of St. Scholastica.

How many bedrooms does the Duluth Mushroom House have?

The Duluth Mushroom House has 5 bedrooms and 3 bathrooms across 2,800 square feet.

Who is the listing agent for the Duluth Mushroom House?

The Duluth Mushroom House is listed by Alicia Lokke with The Lokke Group at Messina & Associates Real Estate.

Photos: @tatimariephotography

Listed by: Alicia Lokke | The Lokke Group at Messina & Associates Real Estate

👉 See the full listing on Zillow

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