One of North Sydney's best-known commercial buildings could become hundreds of new homes, with insurance giant Zurich Australia lodging a State Significant Development Application (SSDA) to transform 5 Blue Street into a mixed-use residential development above North Sydney Station.

Rather than demolishing the existing building and starting again, Zurich is proposing an adaptive reuse project that would convert the landmark office building into a 15-level residential development delivering 62 apartments, 86 affordable co-living dwellings, activated retail and significant upgrades to the Blue Street Plaza.

The proposal reflects a growing trend of commercial property owners repositioning ageing office assets into residential housing as Sydney grapples with housing supply shortages and changing workplace demand.

<img alt="Zurich" data-entity-type="file" data-entity-uuid="0bba7d12-06dc-4375-aad7-238c94b21ac5" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/Screenshot%202026-07-22%20at%2010.42.05%E2%80%AFAM.png?VersionId=NJl5oLAEBDGuPmY3RnyliKODjMc8lvRh" />

Located directly above North Sydney Metro and train station, the 3,051 sqm site occupies one of the most strategically positioned parcels of land on Sydney's Lower North Shore.

Designed by fjcstudio, the proposal seeks to retain and adapt much of the existing structure while creating a contemporary residential address that better connects with the public domain surrounding North Sydney Station.

The application proposes two basement levels, ground floor retail, affordable co-living accommodation across the podium levels, and apartments above, while preserving and enhancing the publicly accessible Blue Street Plaza.

Rather than pursuing maximum apartment numbers, Zurich has opted for a housing mix heavily weighted towards larger owner-occupier residences.

The proposal includes 62 build-to-sell apartments comprising 12 one-bedroom, 19 two-bedroom, 29 three-bedroom apartments and two premium penthouses. It also incorporates 86 affordable co-living dwellings, which would be managed in perpetuity by a Community Housing Provider.

That balance between traditional apartments and affordable housing reflects the NSW Government's push to increase housing diversity around major transport infrastructure.

The proposal has been lodged concurrently with a rezoning application, with Zurich arguing the site is ideally positioned to support additional housing given its immediate proximity to public transport, employment and services.

"The proposal aims to respond to the housing challenges facing Sydney through the delivery of diverse housing types in a highly accessible location," the design report by fjcstudio states. It also seeks to improve pedestrian amenity through upgrades to Blue Street Plaza while creating a high-performing residential building that responds to the surrounding context.

<img alt="Zurich" data-entity-type="file" data-entity-uuid="36082e15-c636-4481-bb68-5a5f6443fe39" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/Screenshot%202026-07-22%20at%2010.41.36%E2%80%AFAM.png?VersionId=5P6VD.fvmqjQfIG3TWWMRXxQWiQBjeFB" />

Rather than replacing the commercial building, fjcstudio has developed a design that works with the existing structural framework above the rail corridor, an approach that significantly reduces demolition while allowing the site to be repositioned as a mixed-use residential precinct.

The existing structural constraints have informed much of the building's design, including its relationship with Blue Street and surrounding public spaces.

The building has been designed as a slender tower rising above a clearly defined podium, with vertically expressed façades intended to reduce the perceived bulk while reinforcing North Sydney's emerging skyline.

According to fjcstudio, the architectural language responds directly to the surrounding commercial towers while maintaining a finer grain expression more closely aligned with the neighbouring Lavender Bay streetscape.

The tower incorporates articulated façade elements, landscaped podium edges and recessed upper levels to soften its appearance and improve pedestrian amenity below.

A significant component of the proposal is the revitalisation of Blue Street Plaza.

The existing public space has long served as one of the primary pedestrian connections between North Sydney Station, Greenwood Plaza and Blue Street, yet its role is expected to become even more important following the opening of Sydney Metro.

Zurich's proposal seeks to strengthen that role by improving landscaping, introducing new retail frontages, enhancing pedestrian permeability and creating more active edges throughout the day and evening.

Ground floor retail would wrap the plaza, while separate residential and co-living entries have been designed to improve wayfinding without reducing street activation.

Landscape design has been integrated throughout the podium and public realm, softening what is currently one of the most heavily urbanised parts of North Sydney.

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fjcstudio has carefully oriented apartments towards Sydney Harbour and the CBD while using privacy blades and articulated façades to minimise overlooking between neighbouring buildings.

Large framed openings along the western elevation maximise harbour outlooks, while the eastern apartments have been angled towards the south-east to improve privacy from neighbouring development.

The project forms part of the continuing transformation of North Sydney from a predominantly commercial CBD into a genuine mixed-use city centre.

Since the completion of Victoria Cross Metro Station, developers have increasingly shifted their attention towards residential projects capable of leveraging the area's unparalleled transport connectivity.

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FiveX recently lodged plans for a 61-storey, 490-apartment tower that would become one of the tallest residential buildings in North Sydney if approved.

Aqualand continues to expand its Lower North Shore presence following the completion of AURA on Walker Street and its recent St Leonards and Roseville proposals.

Developers are also progressing projects throughout Walker Street, Miller Street and the Victoria Cross precinct as demand for well-located owner-occupier apartments continues to strengthen.

Joel Robinson

First look: Zurich targets North Sydney office conversion with 148-unit proposal above Metro station

Busy developer Aqualand Prestige has formally taken the next step in its expansion across Sydney's Lower North Shore, lodging a State Significant Development Application (SSDA) for its long-held Archer Street site in Chatswood.

The application covers <a href="https://www.apartments.com.au/new-apartments/51-55-archer-street-chatswood-nsw-2067">51-55 Archer Street</a>, a 1,767 sqm amalgamated site on the eastern edge of the Chatswood CBD, where the developer is seeking approval for a 45-level mixed-use tower delivering 114 apartments, including a significant affordable housing component, alongside retail, commercial space and six basement levels of parking.

The SSDA marks the latest milestone for a project Aqualand has been quietly progressing over the past two years. The developer first secured the site for its Aqualand Prestige platform before undertaking an alternative design excellence process with PTW Architects, ultimately avoiding a formal design competition through the Housing Delivery Authority pathway.

The proposal has evolved considerably from Aqualand's original concept. The revised scheme has been designed around larger owner-occupier product, with an unusually high proportion of three and four-bedroom apartments, targeting the more affluent buyer profile, and downsizer, emerging across the North Shore.

<img alt="Archer St" data-entity-type="file" data-entity-uuid="0171204c-5811-41b5-9b09-2335d1b7c3d0" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/Screenshot%202026-07-22%20at%208.52.48%E2%80%AFAM.png?VersionId=6YTuxfq.puZo7k2wbfgemcO5K3QfXYGQ" />

The 114-apartment mix comprises six studios, 27 one-bedroom apartments, 18 two-bedroom apartments, 50 three-bedroom residences and 13 four-bedroom homes. A quarter of the building will be dedicated to affordable housing, well above the mandated 15 per cent&nbsp;

PTW has structured the building vertically, with affordable housing across levels one to six, premium apartments through levels seven to 31, duplex skyhomes on klevels 32 to 43, a penthouse on level 44, and a rooftop plant level above. Six basement levels will provide resident parking and servicing.

The tower is proposed to reach approximately 154 metres, placing it among a growing collection of residential high-rises transforming Chatswood's skyline.

Rather than competing purely on height, PTW says the design has been driven by creating a slimmer tower capable of delivering significantly larger apartments.

"The primary objective of this project was to create a distinctive building that stands out from the recently approved or built structures in the Chatswood area," the design report states, noting the structural efficiency allows greater investment into apartment quality and resident amenity.

Residents would have access to more than 450 sqm of communal open space including landscaped gardens, swimming pool, rooftop entertaining areas, fitness spaces, community gardens, children's play areas and barbecue facilities.

A major focus of the design has been the public domain.

The ground plane has been opened up through landscaped terraces inspired by Willoughby's sandstone ridges, with native planting, public seating, artwork, retail activation and a series of gathering spaces intended to soften what has traditionally been a hard commercial streetscape.

The landscape strategy references Blue Gum forests once common throughout the area, while incorporating Indigenous storytelling, public art and lighting installations to strengthen the connection to Country.

Chatswood has been one of Sydney's busiest apartment markets over the past 12 months, with a steady pipeline of both new project launches and fresh development applications.

Hyecorp recently launched Celine, a 122-apartment development just along Archer Street, while Changfa and Huirong Group are progressing The Anderson, an 84-apartment project on Anderson Street.

Develotek recently secured approval for a 101-apartment tower on Pacific Highway, while Tian An LFD received the green light for Hammond Greens, its apartment development on the edge of the Chatswood Bowling Club.

Commercial property developer FiveX is also making its move into the residential market. Last month it lodged plans for a 61-storey tower with 490 apartments, which, if approved, would become one of the tallest residential buildings in Chatswood.

Read more:&nbsp;<a href="https://www.apartments.com.au/news/nsw/first-look-fivex-targets-chatswood-skyline-with-61-storey-tower-after-north-sydney-plans">First look: FiveX targets Chatswood skyline with 61-storey tower after North Sydney plans</a>

Aqualand is also expanding its development pipeline following the launch of its luxury residential brand, Aqualand Prestige. The developer has delivered a string of high-end apartment projects across Sydney's affluent suburbs over the past decade, most recently AURA by Aqualand on Walker Street in North Sydney.

[smartcode_project:default project_id=30959 project_image_fid=292863]

It has since quietly assembled its next wave of projects.

Earlier this year Aqualand launched Boronia in Roseville, a boutique 111-apartment development on Larkin Street. The project is one of the first significant apartment developments to launch in the suburb ahead of what is expected to become one of Sydney's most active new housing precincts under the NSW Government's Low and Mid-Rise Housing reforms, which allow greater density around train stations.

[smartcode_project:default project_id=152095 project_image_fid=373685]

The developer has also lodged plans for a two-tower, 413-apartment development on Herbert Street in nearby St Leonards, further strengthening its presence across the Lower North Shore.

Beyond that, Aqualand remains behind the final stage of Barangaroo, where plans will deliver a five-hectare mixed-use precinct comprising new homes, retail, hospitality and community facilities, alongside a new Metro entrance and more than two hectares of public open space, completing the Barangaroo precinct.

Read more:&nbsp;<a href="https://www.apartments.com.au/news/nsw/central-barangaroo-development-takes-big-step-with-concept-proposal-approval">Central Barangaroo development takes big step with concept proposal approval</a>

Read more:&nbsp;<a href="https://www.apartments.com.au/news/nsw/first-look-aqualand-joins-st-leonards-apartment-party">First look: Aqualand joins St Leonards apartment party</a> 
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First look: Aqualand pushes ahead with Chatswood apartment tower as SSDA lodged for Archer Street

Mass timber is becoming an increasingly popular construction material in apartment developments, but Adelaide developer <a href="https://www.apartments.com.au/developers/otello">Otello</a> is taking the approach a step further.

At its new <a href="https://www.apartments.com.au/new-apartments/flowe-bowden-18-gibson-street-bowden-sa-5007">Flowe Bowden</a> development, the exposed cross-laminated timber (CLT) structure isn't just about reducing the building's environmental footprint. It also forms the foundation of a broader wellness strategy, influencing everything from indoor air quality and natural materials to the way residents move through and experience the building.

The 115-apartment mixed-use development, designed by Melbourne-based architecture practice Fieldwork, will occupy a prominent island site opposite Bowden Village Reserve, combining one, two and three-bedroom apartments with retail and a dedicated wellness destination.

[smartcode_project:default project_id=152022 project_image_fid=375528]

Wellness isn't confined to a gym or shared resident facility at Flowe. Instead, Fieldwork embedded the concept into the building itself.

The development has been split into two residential wings connected by a naturally ventilated central breezeway, replacing traditional enclosed corridors with open-air walkways that improve natural light, encourage cross ventilation and create more opportunities for neighbourly interaction.

"Rather than treating wellness as something that only happens on the ground floor, our response integrates it throughout the building, which led us to ask what it really means to design a healthy building," Fieldwork Director Quino Holland said.

[smartcode_project:default project_id=152022 project_image_fid=375531]

The building's architecture also reflects Bowden's industrial heritage. The lower podium references the area's historic brick and sandstone buildings, while the upper levels transition to exposed CLT, allowing the timber structure to become a defining feature throughout the apartments and shared spaces.

The use of mass timber sits alongside a range of sustainability initiatives, including a fully electric, gas-free design, rooftop solar and a targeted 5 Star Green Star rating.

[smartcode_project:default project_id=152022 project_image_fid=375524]

Inside the residences, the focus remains on natural, durable materials. Blackbutt engineered timber flooring, exposed CLT ceilings, porcelain surfaces and warm timber joinery create a calming interior palette, while low-VOC finishes and responsibly sourced materials have been selected to improve indoor air quality.

Kitchens have been designed as the centrepiece of each apartment, featuring porcelain island benchtops, timber-look cabinetry and brushed steel tapware, with layouts that maximise natural light and ventilation.

[smartcode_project:default project_id=152022 project_image_fid=375530]

The more traditional interpretation of wellness comes in the form of Level Eleven, a two-storey wellness club spanning the ground floor, mezzanine and first floor.

The facility will include a gym, yoga and reformer Pilates studios, Finnish and infrared saunas, magnesium hot and cold plunge pools, and dedicated recovery spaces. Unlike many residential wellness facilities, Level Eleven will also operate commercially, allowing the broader Bowden community to access the venue while giving residents exclusive membership benefits.

The ground floor has also been designed around everyday living. A café overlooking Bowden Village Reserve will activate the street frontage, while a bike workshop with tool storage, co-working space and dog wash has been incorporated to support daily routines and encourage interaction between residents.

"Flowe brings together my two biggest passions, creating places and creating healthier lives," Otello founder Daniel Harris said.

"We wanted to create something Adelaide hasn't seen before, a genuinely healthy building, where the way you live is lifted without even trying."

Flowe is positioned directly opposite Bowden Village Reserve and within walking distance of Bowden Railway Station and the Adelaide Entertainment Centre, placing future residents just minutes from the Adelaide CBD while remaining connected to one of the city's most established urban renewal precincts.

[smartcode_project_cta:default project_id=152022]

Otello launches wellness-focused Flowe Bowden with Adelaide-first mass timber apartment design

Not all apartment amenities are immediately visible.

Swimming pools, gyms, rooftop terraces and residents' lounges have long featured on buyers' wishlists, but as the way Australians live has changed, so too have the features that make apartment living more convenient.

Increasingly, buyers are placing value on the practical aspects of day-to-day life. Fast internet, EV charging, secure bike storage, flexible workspaces and parcel management are becoming just as relevant as lifestyle amenities, reflecting changing habits and expectations.

Online shopping has been one of the biggest drivers of that shift.

Australians spent a record $82.6 billion shopping online in 2025, with almost one in every four retail dollars now spent digitally, making parcel deliveries a routine part of everyday life rather than an occasional convenience.

For apartment residents, however, receiving those deliveries isn't always straightforward.

Without someone home to accept a parcel, deliveries can be redirected to a nearby Post Office, left in building foyers or common areas, or require building management to temporarily store packages. As apartment living continues to grow across Australia's cities, parcel management has become an increasingly important consideration for both residents and developers.

Australia Post's Parcel Locker network is one response to that shift.

<iframe allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen="" frameborder="0" height="315" referrerpolicy="strict-origin-when-cross-origin" src="https://www.youtube.com/embed/KPZ9j5FRdsQ?si=Qztc1dNP3ZvEIUhb" title="YouTube video player" width="560"></iframe>

Rather than relying on home delivery, eligible parcels can be directed to a nominated Parcel Locker, where they're securely stored until collected. Once a parcel arrives, residents receive a notification through the AusPost app or SMS and can retrieve it using a one-time code or QR code at a time that suits them.

The network has expanded to more than 1,500 locations nationwide, with Parcel Lockers positioned at Post Offices, shopping centres, supermarkets, transport hubs and, increasingly, within or alongside residential developments.

That growing presence reflects a broader change in how apartment buildings are being planned.

Developers are increasingly considering the operational side of apartment living alongside traditional lifestyle amenities. Just as secure mailrooms, bicycle storage and EV charging have become more common inclusions, parcel management is emerging as another feature that supports everyday convenience.

It also helps preserve the arrival experience within a building. Carefully designed lobbies and communal spaces can quickly become cluttered when deliveries accumulate, while secure parcel solutions reduce the likelihood of missed deliveries or parcels being left unattended.

For buyers comparing apartments, these everyday details are becoming part of the decision-making process.

Location, floorplans and finishes remain fundamental, but the features that simplify daily life are carrying greater weight than they once did. As online shopping continues to shape consumer behaviour, secure parcel delivery is increasingly becoming another amenity worth looking for.

Parcel delivery is joining the apartment amenity checklist

Inca Property Group has lodged a State Significant Development Application (SSDA) for Dawn, a 53-apartment oceanfront development overlooking Mona Vale Beach.

The proposal, at 35-39 Darley Street East, would replace an existing 18-apartment strata building with a new owner-occupier-focused development comprising 53 two and three-bedroom apartments, including nine affordable built-to-rent residences delivered under the State's infill affordable housing scheme.

Positioned on a 2,679 sqm elevated site around 280 metres from Mona Vale Beach, the development has been designed to maximise panoramic ocean views while responding to the site's sloping topography.

<a href="https://www.apartments.com.au/developers/inca-property-group">Inca Property Group</a> Managing Director Josh Thompson said the State Significant pathway provided greater certainty for projects of this scale.

"This State Significant pathway gives the team real certainty to progress <a href="https://www.apartments.com.au/new-apartments/dawn-35-39-darley-street-east-mona-vale-nsw-2103">Dawn</a> through to completion," Thompson said.

"It allows us to acquire a one-off site, design it carefully and deliver the right offering for the suburb, assessed by the NSW Government's planning department."

The project is one of the first developments in the area to be assessed under the NSW Government's Low and Mid-Rise Housing policy, with the site sitting on the edge of the policy's designated inner area.

The proposal includes three basement levels providing 124 car spaces, alongside a range of resident amenities including a swimming pool, gym, sauna, wellness facilities and private plunge pools for selected ground-floor and penthouse apartments.

<img alt="Dawn" data-entity-type="file" data-entity-uuid="fc1a1daf-0ce4-4f12-9076-b1fa553c7a91" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/Screenshot%202026-07-21%20at%208.42.11%E2%80%AFAM.png?VersionId=4GZ9h.gpNkTljbxyAET8Jfhv51XUamDm" />

Thompson said Dawn had been designed specifically for owner-occupiers and downsizers, a buyer profile that has driven demand across Inca's recent Upper North Shore developments.

"The majority of buyers in our recent North Shore projects have been downsizers, and we are learning exactly what this market is looking for. Beyond the location itself, we have included resort-style amenities to deliver a genuine lifestyle offering," Thompson said.

Located within walking distance of Mona Vale Beach, the town centre, Mona Vale Golf Club and the Royal Motor Yacht Club, Dawn represents Inca's first Northern Beaches project following the sell-out of Tara on Park in Waitara and Ellis Residences, currently under construction in St Ives.

Construction will be undertaken by Inca's in-house construction arm, GOP Constructions.

Dawn is the latest major apartment proposal for Mona Vale, with the suburb emerging as one of the key beneficiaries of the NSW Government's new Low and Mid-Rise Housing policy.

New developer One Living, led by industry veteran Joseph Scuderi, recently secured a site on Mona Vale Road, on the border of Mona Vale and Pymble, where it is planning around 140 apartments.

IPM is also planning its third project in Mona Vale, significantly increasing the scale of its previous developments with an 82-apartment proposal at <a href="https://www.apartments.com.au/new-apartments/159-167-darley-street-west-mona-vale-nsw-2103">159-167 Darley Street West</a>, opposite Bayview Golf Course and less than 800 metres from Mona Vale town centre.

Read more:&nbsp;<a href="https://www.apartments.com.au/news/nsw/one-living-enters-sydneys-new-apartment-market-with-northern-beaches-site-acquisition">One Living enters Sydney's new apartment market with Northern Beaches site acquisition</a>

Read more:&nbsp;<a href="https://www.apartments.com.au/news/nsw/first-look-ipm-plans-third-mona-vale-project">First look: IPM plans third Mona Vale project</a>

First look: Inca eyes Mona Vale with State Significant DA for Dawn apartments

Sea Level

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Over the past two weeks, storms pummelling the New South Wales coast have left beachfront homes at Wamberal on the verge of collapse. It’s stark proof of the risks climate change and sea level rise pose to coastal areas.
Our new research published today puts a potential price on the future destruction. Coastal land affected by flooding – including high tides and extreme seas – could increase by 48% by 2100. Exposed human population and assets are also estimated to increase by about half in that time.
Under a scenario of high greenhouse gas emissions and no flood defences, the cost of asset damage could equate up to 20% of the global economy in 2100.
Without a dramatic reduction in greenhouse gas emissions, or a huge investment in sea walls and other structures, it’s clear coastal erosion will devastate the global economy and much of the world’s population.
In Australia, we predict the areas to be worst-affected by flooding are concentrated in the north and northeast of the continent, including around Darwin and Townsville.
<img src="https://images.theconversation.com/files/350326/original/file-20200730-23-rmfjij.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" alt="Man cleans up after Townsville flood"> 
A clean-up after flooding last year in Townsville, an Australian city highly exposed to future sea level rise. Dan Peled/AAP
<h2>Our exposed coasts</h2>
Sea levels are rising at an increasing rate for <a href="https://oceanservice.noaa.gov/facts/sealevel" target="_blank">two main reasons</a>. As global temperatures increase, glaciers and ice sheets melt. At the same time, the oceans absorb heat from the atmosphere, causing the water to expand. Seas are rising by about 3-4 millimetres a year and the rate is <a href="https://www.ipcc.ch/srocc/" target="_blank">expected</a> to accelerate.
These higher sea levels, combined with potentially more extreme weather under climate change, will bring damaging flooding to coasts. Our study set out to determine the extent of flooding, how many people this would affect and the economic damage caused.
We combined data on global sea levels during extreme storms with projections of sea level rises under moderate and high-end greenhouse gas emission scenarios. We used the data to model extreme sea levels that may occur by 2100.
We combined this model with topographic data (showing the shape and features of the land surface) to identify areas at risk of coastal flooding. We then estimated the population and assets at risk from flooding, using data on global population distribution and gross domestic product in affected areas.
<img src="https://images.theconversation.com/files/350322/original/file-20200730-29-eqrhbr.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" alt="Homes at Collaroy in Sydney damaged by storm surge">
Many coastal homes, such as these at Sydney’s Collaroy beach, are exposed to storm surge damage. David Moir/AAP
<h2>Alarming findings</h2>
So what did we find? One outstanding result is that due to sea level rise, what is now considered a once-a-century extreme sea level event could occur as frequently as every ten years or less for most coastal locations.
Under a scenario of high greenhouse gas emissions and assuming no flood defences, such as sea walls, we estimate that the land area affected by coastal flooding could increase by 48% by 2100.
This could mean by 2100, the global population exposed to coastal flooding could be up to 287 million (4.1% of the world’s population).
Under the same scenario, coastal assets such as buildings, roads and other infrastructure worth up to US$14.2 trillion (A$19.82 trillion) could be threatened by flooding.
This equates to 20% of global gross domestic product (GDP) in 2100. However this worst-case scenario assumes no flood defences are in place globally. This is unlikely, as sea walls and other structures have already been built in some coastal locations.
In Australia, areas where coastal flooding might be extensive include the Northern Territory, and the northern coasts of Queensland and Western Australia.
Elsewhere, extensive coastal flooding is also projected in: - southeast China - Bangladesh, and India’s states of West Bengal and Gujurat - US states of North Carolina, Virginia and Maryland - northwest Europe including the UK, northern France and northern Germany.
<img src="https://images.theconversation.com/files/350319/original/file-20200730-35-19xjvnc.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" alt="A woman struggles through floodwaters in Bangladesh">Bangladesh is among the nations most exposed to coastal flooding this century. SOPA
<h2>Keeping the sea at bay</h2>
Our large-scale global analysis has some limitations, and our results at specific locations might differ from local findings. But we believe our analysis provides a basis for more detailed investigations of climate change impacts at the most vulnerable coastal locations.
It’s clear the world must ramp up measures to adapt to coastal flooding and offset associated social and economic impacts.
This adaptation will include building and enhancing coastal protection structures such as dykes or sea walls. It will also include coastal retreat – allowing low-lying coastal areas to flood, and moving human development inland to safer ground. It will also require deploying coastal warning systems and increasing flooding preparedness of coastal communities. This will require careful long-term planning.
All this might seem challenging – and it is. But done correctly, <a href="https://www.propertyobserver.com.au/https://www.pnas.org/content/111/9/3292" target="_blank">coastal adaptation</a> can protect hundreds of millions of people and save the global economy billions of dollars this century.
<a href="https://theconversation.com/profiles/ebru-kirezci-1140869" target="_blank">Ebru Kirezci</a>, PhD candidate, <a href="https://theconversation.com/institutions/university-of-melbourne-722" target="_blank">University of Melbourne</a> and <a href="https://theconversation.com/profiles/ian-young-807759" target="_blank">Ian Young</a>, Kernot Professor of Engineering, <a href="https://theconversation.com/institutions/university-of-melbourne-722" target="_blank">University of Melbourne</a>
This article is republished from <a href="https://theconversation.com" target="_blank">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/unwelcome-sea-change-new-research-finds-coastal-flooding-may-cost-up-to-20-of-global-economy-by-2100-143599" target="_blank">original article</a>.
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j.ballantyne1990-6AQqhLzZaK

Research finds coastal flooding may cost up to 20% of global economy by 2100

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GUEST OBSERVER
You may have seen recent maps showing how sea level rise may effect coastlines worldwide, including Australian cities. These maps have been produced by US-based website Climate Central.
For instance the video shows what they forecast sea level rise would be like in Melbourne with 4℃ and 2℃ of warming. This is not necessarily sea level rise that will occur over the coming century, but the eventual sea level locked in under particular temperature scenarios. It could take under 200 years or up to 2,000 for sea levels to reach these levels.
The picture isn’t pretty.
Maps such as these have triggered heated debate and discussion in different places in Australia (for instance Eurobodalla and Batemans Bay in New South Wales ) as individuals and organisations wrestled with the implications for property values, policy, long term planning and future risk management of our coastlines.
So is it time to sell up?
Coasts are always changing
This mapping helps us realise that coastlines are not static like property boundaries. They are in fact incredibly dynamic and continue to adjust to changes in sea level. The ambulatory nature of coastlines is a point worth remembering.
It is incredibly important to emphasise that the geomorphological, geological, ecological (i.e. dunes or reefs), or built characteristics of your local coastal environment have a huge influence on how coastlines respond to changing sea levels.
In some places beaches are advancing due to an excess in sand supply, while in other places a lack of sand means a coastline can recede (such as Old Bar on the mid-north coast of New South Wales). Furthermore, coral islands in the Pacific are now known to be dynamic in how they change shape and form in response to rising seas.
The rate of sea level rise is important in this regard. The point is, these maps cannot be taken at face value because they mask locally relevant environmental processes that will impact how sea level rise is experienced at any one place.
How are communities adapting to sea level rise?
In countries like Australia local and regional governments are doing more robust local studies forecasting sea level rise and coastal change. Good examples are the projects Mapping and responding to coastal inundation - undertaken jointly by the Sydney Coastal Councils Group and the CSIRO; and Coastal Vulnerability to Multiple Inundation Sources (COVERMAR) - a partnership between the Sydney Coastal Councils Group and the University of Sydney. Such efforts are much more useful for responding to the threats of sea level rise.
Recently proposed changes to policy and legislation in NSW make explicit the need to consider climate change and the risks it poses to our way of life. The proposed Coastal Management Act goes further and makes explicit mention of the risks posed by extreme storm events (compounded by rising sea levels) to our built environment and life.
The need for local information
Broad-scale maps such as these provide a visceral link between a warmer and wetter world, which can provide the general public with a broad educational tool to help them visualise and grasp what sea level change might look like in their local area.
They are useful for initiating local conversations in communities about the possible locations of critical infrastructure (e.g. nuclear power stations at coastlines) that will have life spans running to hundreds of years or even longer.
But to actually plan for sea level rise we need good, local information. In NSW decisions about coastal management are made mostly by local government. These decisions come about after a detailed study of the local coastal processes and environment, and the values placed on the coastal environment (e.g. property, recreation, aesthetics etc.).
Using a risk-based approach to coastal management and planning will help ensure that new high value development (e.g. infrastructure, power stations etc.) is not placed in areas exposed to rising seas.
The problem is existing development in areas now known to be hazardous with the most comprehensive analyses being presented in the National Coastal Risk Assessment  published by the Commonwealth Department of the Environment. A risk-based planning process should seek to avoid repeating those mistakes, but also allow for continued use of those areas until such time as it is unsafe.
Evaluating and making decisions about those risks is incredibly difficult and fraught with complexity (coastal evolution is the result of multiple factors), ambiguity (whose values matter?) and uncertainty (what really will happen in 100 years?). Having said that, coastal planners all over Australia (and around the world for that matter) are grappling with these issues. But, we still have a very long way to go.
Filippo Dall'Osso is researcher at the Natural Hazards Research Group, University of Sydney and can be contacted <a href="https://theconversation.com/profiles/filippo-dallosso-206055" target="_blank">here</a>.
Dale Dominey-Howes is associate professor in Natural Disaster Geography, University of Sydney and can be contacted <a href="https://theconversation.com/profiles/dale-dominey-howes-112724" target="_blank">here</a>.
Tom FitzGerald is PhD candidate in coastal hazard risk management, University of Sydney and can be contacted <a href="https://theconversation.com/profiles/tom-fitzgerald-17927" target="_blank">here</a>.
All are authors for The Conversation.
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