Great Island Estate: Inside Connecticut’s Most Famous Waterfront Property

I still remember the first time I read about Great Island Estate. As an architect, I have studied a lot of grand old properties. But this one stood out. A 63-acre private island, one mile of shoreline, a 13,000-square-foot manor, and a price tag that touched $175 million at one point. That is not a normal listing. That is a piece of American history sitting on the water.

At rivonhome, I write about homes that inspire us, and Great Island Estate is one of the most inspiring in the country. In this article, I will walk you through its history,Great Island Estate architecture, its sale story, and what it looks like today. I will keep it simple and honest, the way I would explain it to a friend.

Where Is Great Island Estate Located?

Great Island sits in Darien, Connecticut, on the state’s famous Gold Coast along the Long Island Sound. It is connected to the mainland yet feels completely private once you arrive. The island is about 55 minutes from New York City, making it rare to find a property this secluded so close to a major city.

What Is Great Island Estate?

Great Island Estate is a private island off the coast of Darien, Connecticut, on the Long Island Sound. It sits about 55 minutes from New York City. The property covers roughly 60 to 63 acres, depending on how the parcels are measured, with over a mile of natural shoreline.

The estate includes:

• A 13,000-square-foot Italianate manor house
• A three-bedroom stone house
• A 19th-century farmhouse
• A seaside bungalow and beach cottage
• An equestrian facility (Serenity Show Stable)
• A deep-water dock that can hold a 100-foot yacht
• A white sand beach

For decades, this was one of the last untouched Gilded Age estates in the country still owned by one family.

The History Behind Great Island Estate

The story starts with William Ziegler. He was a baking powder magnate, one of the founders of Royal Baking Powder Company, and also a major financial backer of Arctic exploration expeditions. In 1902, he bought Great Island and turned it into a private summer retreat.

Ziegler passed away on the island in 1905. His family kept the property for well over a century, passing it down through generations, including the Steinkraus branch of the family. William Steinkraus, a descendant, was even an Olympic equestrian, which explains the estate’s serious horse stables.

For a long time, this was simply a quiet family compound. But as real estate prices on Connecticut’s Gold Coast climbed, Great Island Estate became one of the most talked-about properties in the state.

Great Island Estate Sales: The Full Timeline

Great Island Estate has one of the more interesting sale histories I have come across. It was originally listed as one large parcel, then split, then sold in pieces over the years. Here is a simple timeline:

Combined, the two main parcels of the original estate brought the Ziegler family a total of about $142.5 million. That made it one of the largest residential land sales in Connecticut history, just ahead of Copper Beech Farm in Greenwich, which sold for $138.83 million.

This is a good example of what people mean when they talk about big island estate saleslike Great Island Estate sales. Waterfront land like this is almost impossible to find anywhere on the East Coast today, and that scarcity is exactly why the numbers climbed so high.

Is Great Island Real Estate For Sale Today?

although some structures, such as the historic manor and the equestrian facility, remain closed while the town determinesIn 2023, the Town of Darien purchased the 60-acre Great Island parcel for $85 million, using a mix of town funds and a state grant. Instead of letting the estate go to a private buyer, the town chose to preserve it as public land. Great Island opened to residents for walking access in March 2024, though some structures, like the historic manor and the equestrian facility, remain closed while the town figures out their future.

The neighboring Ziegler Farm parcel was sold privately in December 2023 for $57.5 million and remains in private hands. So while Great Island itself is public now, it is no longer part of the “great island real estate for sale” market that people search for.

The Great Island Vision Plan

This is the part that interests me most as an architect. The Town of Darien hired Reed Hilderbrand, a respected landscape architecture firm, to create a long-term master plan for the island. The goal is to turn it into an ecologically sustainable public space that still respects its history.

The plan focuses on a few key ideas:

• Public access to the water through walking paths and beaches
• Restoring natural habitat along the 1.5 miles of coastline
• Reusing existing structures, like the carriage house, instead of demolishing them
• A phased rollout, so the town does not have to do everything at once

You can follow updates directly on the Town of Darien’s Great Island page. It is a strong case study in balancing preservation with public use, something I talk about often on our Home Decor page when discussing how old buildings can get a second life.

What Makes the Architecture Special

Great Island Estate is a great teaching example of Gilded Age design. A few things stand out to me:

• The Italianate manor uses a rocky bluff as its foundation, so the house feels like it grows out of the land rather than sitting on top of it.
• Multiple smaller buildings instead of one massive structure. This spreads out the living space and keeps each building in scale with its surroundings.
• Materials chosen for the coast. Stone and weathered wood hold up well against salt air, which is a lesson any homeowner near water should take seriously.
• The dock and equestrian facility were built for a working, active lifestyle, not just for show. That is a detail a lot of modern luxury homes miss.

If you are planning your own home near water, these are timeless choices worth studying, whether your budget is $175 million or a fraction of that.

For families or advisors thinking through generational property like this, it is also worth mentioning that a big island estate planning council or a private estate planning attorney is usually involved long before a sale like this happens. Properties this large rarely change hands quickly, and the Ziegler family’s decision took years of planning across multiple generations.

Great Island Estate vs. Other “Great Island” Properties

One thing that confuses people online: there are other places called Great Island that have nothing to do with this Connecticut property.

• Great Island RI real estate refers to a different coastal area in Rhode Island, unrelated to the Darien estate.
• Great Island MA real estate refers to a spot near Wellfleet, Massachusetts, also unrelated.
• Great Island recipes is a totally different topic, tied to a cooking blog, not this property at all.

If you searched for any of those and landed here, just know this article is specifically about the Darien, Connecticut estate, which is widely considered the greatest island estate sale the state has ever recorded.

Final Thoughts

Great Island Estate is more than just an expensive property. It is a story about one family’s legacy, a century of quiet ownership, and a town that chose preservation over another private sale. As someone who has spent my career studying how buildings and landscapes affect our wellbeing, I find the Great Island Vision Plan one of the more hopeful projects happening right now. A private paradise is slowly becoming a public one, without losing its history in the process.

If you enjoyed this deep dive into architecture and design history, browse more stories like this on our Famous House page.