For sale: Site of grisly 1994 Wellington murders of insurance brokers Gene and Eugene Thomas

An office building that was the scene of two grisly murders is up for sale in Wellington.

The property - at 136 The Terrace - once known as Invincible House has been put up on the market just recently.

It is the site of the infamous murders of investment and insurance brokers Gene Thomas, 68, and his son Eugene, 30, who were gunned down in their offices in February, 1994. Their bodies were found by cleaners.

John Barlow was later convicted of their murders and served 16 years in jail for the crime.

The Bayleys listing calls the building a "stand alone gem" that would be perfect for owner-occupiers.

"Currently there are two vacant floors (penthouse and level 1) with the balance occupied by a mix of tenants including a dental surgeon, lawyers and surveyors," the listing reads.

"The vacant areas provide options for a part-owner-occupier to relocate their business or for a proactive purchaser to lease up and add value."

The listing reveals that the penthouse floor - which has two outside decks - has inner city views.

The 720 square metre property was designed by architect Edmund Anscombe in 1938 as residential apartments.