Grandiose Mosman family estate with Harbour Bridge and Opera House views sold

A luxury Mosman estate with unobstructed harbour views has been sold at auction.

The property's price guide last year was $23 million.

The residence was designed by architect, Susan Rothwell, while the interiors were designed by Leanne Smeallie and Siobhan Rothwell.

The impressive 1,792 sqm block has unobstructed views of the Sydney Harbour Bridge and Opera House, and is home to a range of resort-style amenities. 

Situated at 28 Ruby Street, the estate features a championship tennis court, pool, and gym, as well as elegant formal and informal entertaining spaces. 

The six bedroom home has six bathrooms, and six car parking spaces. The ensuite master suite has a dressing room with a freestanding stone bath tub.

There is also a secluded guest accommodation with a kitchenette. 

The property is fitted with oversized concertina doors which flow to alfresco areas. 

The exterior features manicured lawns, sandstone walls whilst the interior is paved with timber floors. 

The house also has soaring high ceilings with crystal chandeliers.

The kitchen features Calcutta marble and has a butler's pantry. 

It last sold for $7.55 million in 2008.