Malcolm and Lucy Turnbull walk into pricey Point Piper open for inspection

Prime Minister Malcolm Turnbull and wife Lucy were spotted post-election viewing an apartment in Point Piper, however it was not intended for them.

They were looking for their expat Singapore based son, Alex, a hedge fund manager, his wife, Yvonne Wang and their one year old daughter, Isla.

They dropped by the unrenovated 1960s apartment, (above) apparently on the spur of the moment, while taking an early afternoon stroll around their blue-ribbon neighbourhood.

They didn't turn up to the auction where 14 parties registered to bid from the 27 potential buyers who took contracts.

Last traded in 1966 at $60,200, it was knocked down to buyers who came from Kangaroo Point.

Lucy later told friends they weren't really in the market for an apartment and certainly not that expensive, as it sold for $4.3 million, some $1.2 million over reserve.

With the highest price in the block previously being $3.8 million next door, Belle Property Double Bay agent Albert Sassoon had marketed it as a 'house-sized apartment'.

It has three bedrooms, two bathrooms and a large balcony with views of the Sydney Harbour.

Alex has recently launched a mobile phone application 'GoCatch' with Seek co-founder Paul Bassat. The taxi booking app has been backed by casino tycoon James Packer.

Alex worked for Goldman Sachs before joining a private equity firm in Singapore.

This article was first published in the Saturday Daily Telegraph.