Former media power couple Lisa Wilkinson and Peter FitzSimons are readying to move into a new luxury $15m penthouse, following the sale of their Mosman mansion.

It was revealed on Monday, Wilkinson and FitzSimons had finally sold their long-time Mosman home after it failed to sell at auction following a $24.5m vendor bid.

The home was listed in August with a price guide of $23 million and it is believed to have sold much closer to that figure rather than its auction high.

The former Channel 9 presenter and Nine Media columnist are moving mere minutes away, preferring to stay in the exclusive confines of the affluent Sydney North Shore suburb of Mosman.

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