Stand at the corner of Grant Street and Clinton Street in Charlevoix and you're looking at the house the town actually calls the Mushroom House, the one that gave the whole style its name. Walk to Boulder Park, just outside the city limits, and you'll find more than a dozen more of Young's houses, curved rooflines and undulating stonework just as photogenic, just as unmistakably his. A buyer touring both in the same afternoon would reasonably assume they're shopping the same product with the same rules attached.
They aren't. One of these houses answers to a city commission. The other answers to a neighborhood agreement written in 1923, before the city had any historic preservation ordinance at all. If you're seriously considering one of these properties, that difference matters more than square footage, and it's the reason two houses wearing the same nickname have sold at wildly different points on the price scale.
The Eleven Houses the City Actually Regulates
In 2016, Charlevoix established a Local Historic District specifically to protect Earl Young's work. It covers eleven homes, concentrated along Park Avenue, along with the original landscaping features on those sites. Any exterior change to one of those eleven, from a new roofline to a replaced window, goes through the city's Historic District Commission, which operates under Sections 1.325 through 1.347 of the city code. The commission's authority stops at the property line of what's visible from outside. Interior renovations don't require its sign-off unless the work would change the exterior appearance.
Charlevoix backed this up in April 2020 by becoming a Certified Local Government through the National Park Service and the Michigan State Historic Preservation Office, a designation that ties the city's review process to state and federal preservation standards rather than leaving it entirely to local discretion.
That's the framework for eleven houses. It is not the framework for the rest of them.
The Rulebook Boulder Park Wrote First
Most of Young's stone houses were never built on Park Avenue. They're in Boulder Park, the resort neighborhood platted in 1923 when Mary Bartholomew approached Young to design 85 irregularly shaped lots along the Lake Michigan shore, laid out on curved roads because Young disliked uniform grids. Bartholomew's family sold the land to Young the following year, and he renamed the development Boulder Park.
The neighborhood association Young set up when Boulder Park was founded predates the city's 2016 historic ordinance by roughly a century. It requires the first story of every home to be built of stone, brick, or stucco. Frame cottages could be built if they met "Boulder Park standards," but only with approval from at least three other property owners in the neighborhood. That's a private covenant enforced by neighbors, not a municipal commission with a code section behind it. Construction on the first stone cottage began in October 1925, likely the Green Mortar House, and the Charlevoix Courier described it at the time as "somewhat of a novelty in the line of summer homes." By the following October, three stone cottages were finished, two more were under construction, and excavation had started on two others.
If you buy a Boulder Park stone house today, you are not filing a Certificate of Appropriateness application with the city. You are, in practice, dealing with a nearly hundred-year-old neighbor-to-neighbor agreement about what the front of your house can be made of, and whatever enforcement mechanism the association still exercises.
What That Split Actually Does to Price
The clearest evidence of how much this matters shows up in what Young's original 304 Park Avenue house, known as the Thatch House, has traded for. Built in 1918 as Young's own first home, it has been through a complete exterior and interior reimagining by a later owner, including a hand-thatched roof shipped in from Europe. Between 2022 and 2024, it appeared on the market at multiple price points ranging from $2.8 million to $4.5 million for the same 6,000-square-foot, seven-bedroom footprint.
Compare that to a smaller, less altered Earl Young house that came to market in 2023: a 2,085-square-foot, four-bedroom, three-bathroom home built in the 1950s, listed at $1.42 million.
| Property | Governance | Approx. Size | Notable Listing Price | Period |
|---|---|---|---|---|
| Thatch House, 304 Park Ave | Local Historic District, Commission review | 6,000 sq ft | $2.8M–$4.5M | 2022–2024 |
| 1950s-era mushroom house | Not in Historic District | 2,085 sq ft | $1.42M | 2023 |
The Thatch House sits inside the eleven-house district, yet its owner still pushed the interior into a seven-bath, media-room, wine-cellar version of a mushroom cottage, because the commission's review only reaches what's visible from the street. The stone walls, the roofline, the silhouette that makes it identifiable from a sidewalk are protected. What happens behind that silhouette is not. That's the mechanism behind the price spread: the exterior rules are fixed either way, but how much interior freedom a buyer has to modernize, expand, and add bedrooms and bathrooms is what separates a $1.4 million mushroom house from a $4.5 million one.
The Detail Worth Knowing Before You Tour
As of June 9, 2026, the Charlevoix Historical Society ended its long-running walking tours of the Earl Young houses, a program that had supported the Harsha House Museum for more than two decades. If your image of these homes includes a docent-led group pausing on the sidewalk every hour during the summer season, that specific version of foot traffic is gone.
It doesn't mean the houses stop drawing attention. A self-guided tour map is still available from the Visitors Center at 109 Mason Street, Tour Michigan's electric GEM car excursions continue to run independently, and the Historical Society itself still offers step-on guide service for groups arriving by their own coach. It's specifically the docent-led walking tour that's gone, not the town's interest in these houses.
What to Check Before You Write an Offer
The single most useful thing a buyer can do before making an offer on any Earl Young house is confirm which regime applies to that specific address. An address on Park Avenue near the Historic District boundary should be checked against the city's Earl Young Local Historic District report, since inclusion changes the renovation approval process entirely. A Boulder Park address should be checked against whatever the current neighborhood association still enforces regarding exterior materials, since that's a private agreement rather than a city file.
Either way, ask what's already been changed. The Thatch House's price ceiling came from renovation work that the historic district process allowed because it stayed inside the original exterior envelope. A buyer planning a similar transformation on a different Earl Young house needs to know upfront whether that path is open to them or whether it runs through a commission meeting, a neighbor vote, or both.
A Few Questions Worth Asking Directly
How do I find out if a specific Earl Young address is inside the Local Historic District? The city's district covers eleven homes clustered along Park Avenue. The most direct route is checking the address against the city's Earl Young Local Historic District report and confirming with the Historic District Commission before assuming either way.
Does a Boulder Park stone house without city historic designation mean I can renovate the exterior freely? No. Boulder Park's own neighborhood standard, requiring stone, brick, or stucco on the first story and neighbor approval for exceptions, predates the city ordinance and still applies as a private agreement separate from any municipal review.
Will the end of the Historical Society's walking tours change how much foot traffic these homes see? The organized docent tours have stopped, but the self-guided map from the Visitors Center and independent GEM car tours are still active, so visibility from the street continues in a different form rather than ending outright.
Buying one of Charlevoix's stone houses means buying into a specific set of rules tied to a specific address, not a general reputation. Knowing which rulebook applies before you tour is what separates an informed offer from an expensive surprise. If you're weighing an Earl Young property or another legacy home in the Charlevoix area, Pat O'Brien has spent decades working through exactly these kinds of local particulars with buyers who want the full picture before they commit.
