Completed in 1984, the former Petro-Canada twin towers, now the Suncor Energy Centre, feature a 56-storey and a 34-storey tower covering over 2,600,000 ft2 of space. The complex occupies an entire city block, and both towers are connected via an expansive atrium, which spans two levels and contains a food court and retail space. The four storey underground parkade was significant since three of these levels were below the local water table; special care was required during excavation to deal with this challenge.
The towers were constructed using steel and reinforced concrete frames on concrete foundations. Floors consist of smooth concrete and can sustain heavier than normal loads. The exterior features a glass curtain wall with reflective windows to minimize glare from outside.
This complex also contains 46 passenger and three freight elevators. The west tower remained the tallest building in Western Canada until the completion of the Bow.
This project holds the record as the largest contract in CANA history.