Sydney's floating mansion for sale has to be seen to be believed

A luxury Sydney home for sale is a work of art with its daring design.

The four-bedroom, three-bathroom property at 73 Seaforth Crescent in Seaforth, New South Wales, appears as if it’s floating, thanks to cantilevered architecture.

Incredible listing photos reveal two glass-encased levels that tower above the harbour. Access to the home is from street level but it cascades down to the water, with an inclinator (an outdoor cable lift) and a feature stairwell providing two options for accessing the waves at the base of the block.

Nathan Tse and Jake Rowe of The Agency Northern Beaches are handling the campaign and say the price guide is $10 million to $11 million.

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73 Seaforth Crescent, Seaforth NSW 2092

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Tse says the home is an “incredible piece of engineering” and it’s clear to see in the campaign.

Constructed over five years in the late 1980s and designed by architect Martyn Chapman, the property is an example of cantilevered residential design.

This style was originally used in bridge construction and made its way into high-end, contemporary homes. A cantilever is a protruding beam which is attached to another structure at one end.

The home’s towering design allows for 180-degree views over Middle Harbour from nearly every room.

Entertaining is at the forefront with a waterside terrace and a courtyard with wet bar, barbecue and a retractable roof. Landscaped gardens surround the property and there’s also exclusive use of a jetty and pontoon.

Interiors are a combination of the “vibrancy of New York” and the “elegance of Italy”, the listing details.

Marble floors, traditional Italian Stucco on the ceilings and feature walls are standout elements, alongside the glass stacker doors, circular dining room and chandeliers.

Seaforth is in Sydney’s northern beaches, 12km northeast of the CBD. Domain’s latest data reveals the median house price for the suburb is $3,555,000.

The property is scheduled to go to auction at 9am on Saturday, April 20, unless sold prior.