The waterfront Clontarf trophy home, Portovenere has set a suburb record at more than $10 million.
It was redundant to the Belgiorno-Nettis family needs.
The early 1960s modernist residence was built by the late Transfield co-founder Franco Belgiorno-Nettis and his wife Amina.
With three sons, Marco, Luca and Guido, the couple bought their first lot in 1958 of the eventual 3668-square-metre holding for £2325.
It was just after Belgiorno-Nettis snr and Carlo Salteri founded the construction and engineering company, Transfield.
The family's other recently sold real estate, included $3,665,000 for their Kirribilli apartment, $2.85 million for their Parriwi Road, Mosman apartment and $3.7 million for the house next door to Portovenere.
They were listed following family matriarch Amina Belgiorno-Nettis’ death last September.
Portovenere bettered the suburb's previous high of $8.7 million set in 2009 when Bradley Hunt bought the non-waterfront home of Citigroup executive Paul Sanger.
