Mr Vass, and his wife, Marion, bought the huge home with pool and tennis court on almost 2000 sqm at 31 Coolong Rd in 1986 for the grand sum of $3,725,000.

The listing — with Peter Anderson of Christies — is too fresh for marketing photos, but the huge holding is likely to be popular in a market starved of new trophy home offerings.

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Why Phil Wolanski paid $12.5m in Vaucluse

Christies agents Ken Jacobs and Darren Curtis are also marketing the $55 million absolute waterfront trophy home a few doors down at 21 Coolong Rd.

That’s owned by agribusinessman and investment banker Garrick Hawkins and his wife, Evelyn, who have moved to London.

Their six-bedroom, nine-bathroom mansion is on a smaller 1700 sqm block.

When that hit realestate.com.au three weeks ago it was the most viewed property online that week.

The listing also follows the quick sale further up the street of a home on a non-waterfront block for $12.5 million — that of Michelle Coe, the wife of the late Allco Finance Group founder David Coe.

That property had hit realestate.com.au with a $12 million guide through Ray White Woollahra’s Randall Kemp.

But it was gone within the week — to the property developer Phil Wolanski who owns the waterfront immediately behind.

Mr Wolanski and his wife, Suzanne, bought their home — on a 1,176 sqm battle-axe block — for $6,010,000 in 1998.

It’s not immediately clear what Mr Wolanski plans to do.

But he need only look at the fruits of another Coolong Rd amalgamation — Menulog co-founder Leon Kamenev paid $80 million in 2016 for four blocks totalling 4,270 sqm (including the 3000 sqm double waterfront block of technology entrepreneur David Shein and his wife, Colleen). Mr Kamenov is now building a new waterfront mansion on the huge landholding.

Vass Electrical Industries has been designing, developing and manufacturing smarter Busway systems for more than 50 years.

In 1950, while working in the electrical industry, Nicholas Vass realised the need for a better and safer way to distribute electricity in Australia’s growing manufacturing industry.

He set up Vass Electrical Industries in 1958 and the Vass Electrobar Busway System was to follow.