Rialto Towers

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Official Name Rialto Towers
Structure Type Building
Status Completed
Country Australia
City Melbourne
Street Address & Map 525 Collins Street
Postal Code 3000
Building Function office
Structural Material concrete
Construction Start 1982
Completion 1986
Rankings Click arrows to view the next taller/shorter buildings
Global Ranking #490 Tallest in the World
Regional Ranking #11 Tallest in Oceania
National Ranking #11 Tallest in Australia
City Ranking #7 Tallest in Melbourne

Companies Involved

• Current Dexus Property Group; GIC Private Limited; Grollo Group
• Past St Martins Property
Developer Grollo Group; St Martins Property
Design Gerard de Preu & Partners; Perrot Lyon Mathieson
Structural Engineer
Design Meinhardt
Project Manager Project Planning and Management Pty Ltd
Main Contractor Grocon
Other Consultant
• Property Management Dexus Property Group
• Wind MEL Consultants Pty Ltd
Material Supplier
• Elevator Otis Elevator Company

About Rialto Towers

When completed in 1986, Rialto Towers was the tallest office building in the Southern Hemisphere and was the first building to surpass the 200 meter threshold in Melbourne. The surrounding Rialto district was named in reference to the Venetian gothic architecture found on many of the 19th century buildings developed during the Melbourne gold rush. When the Rialto Towers was first planned in 1981, many of these older buildings from that period had already been demolished, leading to public outcry and the partial preservation of the remaining structures. The main footprint of the Rialto Towers is set into the middle and southern end of the block, preserving the scale of the historic streetscape along Collins Street. The building then rises from a podium base as two interlinked reinforced concrete towers, reaching 43 floors and 63 floors respectively.

The building rests upon 76 reinforced concrete caissons reaching up to 1.8 meters in diameter and 40 meters in below grade. The building’s concrete structure is composed of central service cores in each tower, with floor slabs spanning the distance between the core walls and the perimeter columns, proving for maximum flexibility with interior layouts. As the building approached 30 years in age, a new podium structure was designed and constructed around the base of the Rialto Towers and including a new interior atrium providing a new sheltered public space between the Collins Street sidewalks and the elevator lobbies of the office towers.


How Vertical Transportation is Helping Transform the Modern City
16 Sep 2014 – Glen Pederick, Meinhardt Group

Research Papers

How Vertical Transportation is Helping Transform the Modern City
16 Sep 2014 – CTBUH 2014 Shanghai Conference Proceedings

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