19,082 m2 (205,400 ft2)
Structural Engineering Consultant
$150 M (estimated)
Located in downtown Toronto, the new 31-storey tower at 700 Bay Street is a residential condominium to be constructed at the west end of the existing site that it will share with an existing 24-storey mixed-use rental and commercial tower. Four storeys of residential and amenity space will also be added to the existing building. The entire property is owned by Kingsett Capital.
The new tower will be situated at the west end of the existing 24-storey LuCliff Place property at 700 Bay Street, bounded by Gerrard Street to the north and Elizabeth Street to the west. It will provide striking views of the surrounding area and provide residents easy access to the heart of the city. The project is intended primarily for residential use and includes condominiums, amenity spaces, five levels of below grade parking, and two levels of above grade retail. The additional floors above the existing tower will house rental units and amenities including a fitness space, theater, pool and outdoor terraces.
Challenge: Design the entire complex to act as a single structure able to resist wind and earthquake loads.
Solution: Use the overbuild floors to link the towers and tie the buildings together along their common surface via a new shear wall and dowels into the existing slabs. A wind tunnel study was performed to confirm wind loads. The entire building was checked for the resulting forces and a response spectrum analysis performed for the most accurate seismic loads. Existing building elements were reinforced where necessary.
Challenge: Develop cost-effective foundations.
Solution: The demolition of the existing parking slabs allowed a small, conventional piling rig, to be used on site. Short caissons were then installed to support the new structure instead of micro-piles.
Challenge: Integrate the new 31-storey tower structure without disrupting the functionality of the below-grade parking.
Solution: A transfer slab was designed for the corners of the new tower and the new columns brought down into the parking structure elsewhere. Existing parking slabs were removed and tie-backs of the existing wall introduced to facilitate construction.