An Australian yacht racing heavyweight, Mark ‘Squark’ Bradford helped his crew set a new race record in the Brisbane to Gladstone yacht race this year. RELATED: Yacht racing millionaire flicks massive Riparian unit 11 Norbiton St, is a surprise listing in the sleepy suburb of Zillmere.THE skipper of Queensland’s Sydney-Hobart supermaxi, Black Jack, is selling his Zillmere home less than a month after Black Jack owner Peter Harburg made a multimillion-dollar sale on his double apartment in Brisbane’s Riparian Plaza skyscraper. A modified Black Jack. shown here competing at this week’s SOLAS Big Boat Challenge in Sydney Harbour, is expected to perform well in the Sydney-Hobart yacht race.More from newsParks and wildlife the new lust-haves post coronavirus15 hours agoNoosa’s best beachfront penthouse is about to hit the market15 hours agoThe $400,000 renovation of 11 Norbiton St, Zillmere was turned into a team building exercise for the Bradford family after they purchased the 1956 Queensland War Service home in 2013 for $428,000. The renovation has turned a three bedroom War Service house into a luxury home.The house, on a 620sq m block has been raised and extended to double the internal floor space. Black Jack owner Peter Harburg’s Riparian Plaza apartment that sold last month.MORE: A new wing extends the living space to include a back deck.It is now a four-bedroom house with a study, large covered entertaining areas and a competition height basketball hoop with concreted court area.Zillmere’s median house price is $200,000 less than the Brisbane median, at $480,000, CoreLogic property data shows.Four houses have sold for $1 million or more in Zillmere and the highest sale of 2018 so far has been 28 Fisher Parade, which sold for $799,000 in August.Black Jack owner Peter Harburg had a price guide of $5.2 to $5.6m on his inner city Riparian apartment at 4602/71 Eagle St. It was sold for an undisclosed amount in November. Skipper Mark Bradford and owner Peter Harburg in front of the crew of Black Jack at this year’s Brisbane to Gladstone yacht race. The Queensland supermaxi broke the race record with a course time of just under 17 hours.He is now preparing for his 13th Sydney-Hobart yacht race which kicks off on Boxing Day.