Mosman’s largest exclusive waterfront estate with its own private beach and coveted deep water boating facilities is for sale with agent Geoff Smith of Ray White Lower Shore Group.
This rare 5,223sqm waterfront holding at Mosman represents one of the most significant residential land releases in the harbour city.
With a deep water mooring, this is an exceptional waterfront opportunity to build your dream home on Sydney’s prestigious North Shore.
There are three lots at 10-12 Bay Street, Mosman, and all are now available for sale in three individual lots or in one line.
For over 20 years, the sellers Bryan and Rachelle Rose have worked together developing properties and creating dream homes. Bryan Rose and Rachelle Anne Rose purchased the property in 2017, intending to build a dream home at Quakers Hat Bay in Mosman but with children now grown up they have decided to create the opportunity for another or others to build their dream home on Sydney’s iconic harbour.
The Roses have owned the magnificent holding since 2017. They lived in the main house in Lot 2 before excavating the site in 2022 to make way for their DA-approved dream family home.
Bryan Rose said he immediately saw the unique location and deep water frontage where he could moor the family luxury cruiser on the doorstep. He also recognised a rare opportunity to build a family estate only 25 minutes from Sydney CBD.
To help prospective purchasers, leading local architects Corben Architects has been engaged to design some concepts as inspiration for Lots 1 and 3, while the jewel in the crown of this offering, Lot 2, comes with a DA-approved 3 level luxury residence designed by renowned architect Mark Broadley.
Rachelle Anne Rose saw the property as an opportunity to design an intergenerational home that not only encompassed design elements of sustainable living but also took advantage of the lifestyle offered by a light filled, westerly facing home.
Geoff Smith was appointed by the sellers due to his expertise and experience in selling luxury listings of exclusive calibre.
“These blocks are so rare,” Mr Smith said. “This is the most significant waterfront holding with private beaches available in some time. For discerning buyers seeking their own piece of Sydney Harbour, this is the opportunity not to miss,” he said.
“The combination of size, frontage, private beach access, and development readiness has never been available in a single package with deep water boating facilities.
“This represents more than a real estate acquisition, it’s an opportunity to create a bespoke waterfront estate that will define luxury living on Sydney Harbour for decades to come,” Mr Smith said.
The property has its own private jetty and mooring facilities for luxury living at its best, while the opportunity to purchase an approved 3 lot subdivision on tightly held prestigiously positioned land on Sydney Harbour waterfront, the possibilities for the dream home are endless.
“Properties of this calibre and scale are generational assets. In Mosman’s tightly held waterfront precinct, the combination of size, frontage, private beach access, and development readiness has never been available in a single package with boating facilities.
“This represents more than a real estate acquisition, it’s an opportunity to create a waterfront estate that will define luxury living on Sydney Harbour for decades to come,” Mr Smith said.
The property’s unique positioning offers absolute privacy, bordered by permanent parkland that ensures no future development will compromise the private and quiet outlook.
Lot 1: approx 1,683sqm of premium waterfront land
Lot 2: approx 2,610sqm featuring approved DA for architecturally designed family residence with boatshed and marina berth, approved for 17.4m vessel
Lot 3: approx 930sqm of pristine level land
Combined: 5,223sqm of uninterrupted harbour frontage
Architect Mark Broadley’s design for Lot 2 is a spectacular and elegant intergenerational home across three levels, each inspired by the world’s most beautiful coastal destinations, from Byron Bay’s organic hinterland aesthetic to Pittwater’s light-filled waterfront charm and the rustic elegance of renovated Italian mills.
The DA approved residence design celebrates both community living and private retreat, featuring expansive entertaining areas that flow seamlessly from indoor to outdoor spaces.
Highlights of the design include the grand pavilion designed in detail to capture the spectacular waterfront views while offering a dramatic entertaining space or a serene family living area, a chef’s kitchen incorporating oversized preparation benches and central table with every detail for ample storage carefully considered, an elegant outdoor pavilion, overlooking the bay with outdoor fireplace and rustic overhead beams wrapped in wisteria, a soundproof cinema room, a luxuriously oversized one bedroom apartment referred to as the couples “summer suite,” inspired by the dream of resort style vacation without ever having to leave home.
The approved design incorporates sustainable living principles while maximizing the site’s extraordinary potential.
The approved residence design celebrates both large family living and a private retreat, featuring expansive entertaining areas that flow seamlessly from indoor to outdoor spaces.
Lot 3 is on flat landscaped ground, situated next to never to be built out parkland, lot 3 offers a young family the opportunity to build their dream lifestyle with access to Sydney Harbour through the parkland.
Lot 1 expands over a generous 1,683sqm, a designers dream with waterfront living and scope for a 5-6 bedroom home, expansive entertaining areas that flow seamlessly from indoor to outdoor spaces, a generous infinity pool and 4 car garage all set into the scenic landscape of one of Mosman’s most sought after waterfronts.
This represents a rare opportunity to acquire one of Sydney’s last significant waterfront holdings in such a prestigious location, offering buyers the choice to create their ultimate family estate, develop individual luxury residences, or combine both approaches across the three distinct lots.
The property is for sale via an expressions of interest campaign closing on or before 12 November 2025 at 3pm.
Lot 1 – 1,683sqm price guide $11,500,000
Lot 2 – 2,610sqm price guide $18,500,000
Lot 3 – 930sqm price guide $7,000,000
In one line – 5,223sqm
Address: 10-12 Bay Street, Mosman NSW 2088
Land size: 5,223sqm (larger than a football field)
Harbour frontage: approx 50 metres
Features: Private beach, deep water mooring, DA approved, excavation complete
Status: Ready for immediate development
BY ALEX TILBURY
Head of Media and External Relations
Ray White Corporate
