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The Mansion

The Mansion apartment development is a 17 storey building with three basements constructed under an existing 1880's single storey heritage building.

Quick Facts

Project Type Award Winning, Apartments and Commercial, Civil, Heritage
Project Materials Concrete
Construction Budget $45 million
Project Size Large
Completed Project Yes
Completion Date 2007

Map Location

83 Queens Road, Melbourne

Project Team

Architect Daryl Pelchen Architects

Project Description

The Mansion apartment development is a 17 storey building with three basements constructed under an existing 1880's single storey heritage building.  The new building has a curvilinear glazed façade which partially cantilevers over the heritage building.

 Macleod Consulting provided the structural and civil design for the project.  Particular features of the design include:

  • Post-tensioned raft slab at basement 3 level for the 17 storey building and basements
  • Banded insitu reinforced basement slabs with Ultrafloor slab system
  • Insitu ground floor slab poured around the retained heritage building
  • Post-tensioned transfer slab cantilevering over the heritage building at Level 4 requiring special falsework design and construction
  • Slip formed stair/lift shaft with precast concrete internal walls
  • Site precast shell form curvilinear glazed façade edge floor units (up to 25T lifts)

The retention of the ”Mansion”, a Victorian Italianate style rendered brick heritage building, and the development of a 3 level car park basement to the whole site were two challenges of the town planning approval for this project.  In addition to constructing the basement under the “Mansion”, a recently constructed 16 storey building on the north site boundary required consideration.

MacLeod Consulting developed an innovative partially pre-stressed steel beam solution "tuned" to achieve similar deflections for varying loadings for the support of the “Mansion”.  These steel beams were supported by split poured reinforced concrete beams on CFA piles, installed on a temporary basis.  After excavating, the basement permanent supporting columns for both the new and existing building were constructed and the temporary piles removed.

During pile footing design, Macleod Consulting worked closely with Vibropile Australia Pty Ltd on the support system below the existing building and a hard-soft secant pile wall design for the protection of the adjacent 16 storey building on the north boundary.

On completion, 164 apartments were fitted out in the new building, and 8 in the existing, with 210 car parking spaces in the basement levels.


MacLeod, K., & Tchepak, S. (2006). Engineering the Mansion's heritage.

10th International Conference on Piling and Deep Foundations, Amsterdam



Master Builders Association of Victoria Excellance in Construction Awards 2005 - Specialist Contractor of the Year (Vibropile) - Most Innovative Construction Methods