28/51 William St, Double Bay is a 3 bedroom, 2 bathroom Unit with 2 parking spaces and was built in 2001. The property has a land size of 5173m2 and floor size of 141m2. While the property is not currently for sale or for rent, it was last sold in September 2017.
Perched atop the landmark 'Montage', a prestigious Mirvac-designed building in the heart of the village, this luxurious penthouse combines the scale of a house with the security and lock-up-and-leave convenience of apartment living. Surrounded by gated estate-like grounds with a choice of private roof terraces. Level lift access to double parking and the foreshore offers the ultimate in cosmopolitan harbourside living, 200m to the beachfront and marina.
+ House-like proportions and a well-conceived free-flowing layout
+ Full length terrace with a private open outlook, magical by night
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** Photography and illustrations are for presentation purposes only and should be regarded as indicative representations only.
The size of Double Bay is approximately 0.8 square kilometres. It has 6 parks covering nearly 10.0% of total area. The population of Double Bay in 2016 was 4642 people. By 2021 the population was 4709 showing a population growth of 1.4% in the area during that time. The predominant age group in Double Bay is 30-39 years. Households in Double Bay are primarily childless couples and are likely to be repaying over $4000 per month on mortgage repayments. In general, people in Double Bay work in a professional occupation.In 2021, 53.10% of the homes in Double Bay were owner-occupied compared with 54.90% in 2016.
Double Bay has 3,723 properties. Over the last 5 years, Houses in Double Bay have seen a 51.44% increase in median value, while Units have seen a 34.79% increase. As at 31 January 2026:
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