100 Mount Street, North Sydney

100 Mount Street, North Sydney

Designed by Architectus in association with SOM (Chicago) 100 Mount Street is a 35 storey mixed-use tower designed to achieve a 5 Star Green Star Design and As Built v1.1 rating and 5 Star NABERS Energy rating. The International WELL Building Institute™ has awarded 100 Mount the WELL Core & Shell Gold Pre-certification.

Designed as an elegant and efficient glass volume, the tower is oriented toward the north and south with its core elements and structure expressed on the east and west. At ground level the core has been offset to provide a large public plaza with high visibility through the site and activated ground plane.

Working within the extremities of the approved envelope, the elegant tower form is born from a regular rectangular floor plate that features highly transparent glazing subtly articulated by exposed structural elements. 

The double skin glass facade features an automated venetian blind system, housed within a cavity, which minimises solar gain while maintaining views out. The mega brace on the eastern façade is designed to be both structurally efficient and elegantly proportioned.

A band of retail storefront is maintained along Walker Street and street level activity continues around the corner of Mount Street and into the public plaza along a public through-site link. At 8 metres tall the ceiling of the plaza is lifted to allow views and daylight through the site. The ground plane is further enhanced by moving the vehicle entry to Walker Street, removing more than 100 cars from the Spring Street lane network, and improving pedestrian amenity.

The office floor plan maximises the buildable area of the site while allowing for a minimal footprint. Consistent large floor plates of up to 1200 m² achieve a 89 per cent efficiency NLA to GFA. Forty per cent of office space is within 4.5 metres of the facade with 800 m² contiguous column-free space creating high potential for flexibility in office layout.


Project Sheet

Project Summary

Dexus Property Group
North Sydney, NSW
Floor area
42 117 m² Office NLA, 700 m² Retail
Early 2019
Ray Brown