Otford's unique geodesic dome home has hit the market for the third time since it was built in the mid-1980s.
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A buyer can expect to pay between $2 million and $2.2 million for the unconventional four-bedroom home at 129 Otford Road, which is set on a coastal acreage.
"These types of homes don't come along very often," selling agent Mattias Samuelsson of Ray White Helensburgh said.
"Five acres of pristine bushland, with no neighbours in sight - it's certainly an appealing prospect."
Current owner Kara, who did not want her surname used, first attempted to buy the house about 14 years ago when the original owner-builder put it up for sale, but was "pipped at the post" by a famous Australian jazz musician who was captivated by its powerful acoustics.
A year later, Kara got a call from an agent - the muso was moving on and the house was up for grabs if she still wanted it. She snapped it up.
"We just fell in love with all the cedar and the space for the kids," she said.
"My husband always had a dream of having some acres and I loved the coast - it's as rare as the proverbial hen's teeth, a coastal acreage within an hour of Sydney and 25 minutes to Wollongong.
"My son also had really bad asthma, and pollution was a trigger for him, so we wanted to get him to the freshest air we could find and how fresher can you get than next door to the Royal National Park?"
After they were handed the keys, Kara and her builder husband got to work restoring the rundown house, knocking out walls to open up the space and show off the interior's high ceilings and sweeping rafters.
They brought the hexagonal cedar panelling back to its former glory, before renovating the kitchen and bathroom, which features a luxurious sunken bathtub that can comfortably fit two adults.
"It's like living in a piece of art because of all the angles and the fine detail with the beautiful cedar," Kara said.
"What's really remarkable about the house is that it's really spacious but cosy. It was designed to be very good at managing temperatures, not too cold, not too hot."
Outside, Kara's two boys - now grown up - spent their childhood dangling from a massive tree swing, building cubbies, spotting wildlife, looking after their many pets - and playing cricket.
"The property's big enough that my husband put in a fully enclosed cricket pitch, and then Santa bought an electric bowling machine," Kara said.
"It was a brilliant place for them to grow up ... I feel very fortunate that I was able to raise my kids in that healthy, spacious, fun, cosy environment. I've loved it and I'm now a bit of an empty nester, and just looking to downsize."
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