Two four-storey mansions are currently under construction on a 539sqm block of land in Jutland Parade with a seven-storey mansion in between them.

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The seven-level home has 3,500sqm of interior space, which is the same floor space as a big supermarket, the new Perth library or 15 average-sized homes. The three levels below are reserved for living space, which include five or six bedroom suites with a fourth level for parking 16 cars. The three levels below are for storage including for a boat, which leads out to a private jetty. Construction is believed to cost an approximate $21 million.

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Both twin four-storey homes either side of it are 2,800sqm, which also include three levels of living space and a fourth level for parking up to 16 cars.

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The development began in 2016 but stopped for three days, when the building permit expired on July 9, 2018. The owners applied for a further extension and were initially refused, based on the allegations they'd built staircases, an amphitheatre and a retaining wall that was not on the approved plans.

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The three mansions have now been under construction for five years.