707 Fifth – Manulife Place

707 Manulife
707 Manulife
707 Manulife

A sustainable hub in downtown Calgary, this cutting-edge office development provides flexible workspaces, enhances the public realm, and improves connectivity with a new elevated pedestrian bridge.

Project Facts
  • Status Construction Complete
  • Completion Year 2017
  • Design Finish Year 2014
  • Size Building Height: 124 meters Number of Stories: 27 Building Gross Area: 75,433 square meters
  • Awards 2018, SEAOI Excellence in Structural Engineering Award - Award of Merit, Structural Engineers Association Of Illinois
  • Sustainability Certifications LEED BD+C NC (New Construction) Gold, BD+C, Gold
Project Facts
  • Status Construction Complete
  • Completion Year 2017
  • Design Finish Year 2014
  • Size Building Height: 124 meters Number of Stories: 27 Building Gross Area: 75,433 square meters
  • Awards 2018, SEAOI Excellence in Structural Engineering Award - Award of Merit, Structural Engineers Association Of Illinois
  • Sustainability Certifications LEED BD+C NC (New Construction) Gold, BD+C, Gold

Distinctive design, shaped by the climate

707 Fifth – Manulife Place celebrates Calgary’s cosmopolitan atmosphere while efficiently addressing the demands of the Canadian prairie climate, characterized by cold and harsh winters tempered by warm Chinook winds and an above-average number of sunny days per year. These conditions informed the design of the tower, with a high-performance, triple-glazed exterior wall, a conditioned above-grade pedestrian bridge, and dynamic enclosed public spaces.

Clad in a sweeping glass curtain wall, the slender, elliptical, 27-story office tower is distinct from its neighbors. Two curved convex facades meet to form a concave surface along the building’s narrow eastern and western edges. The design creates a dramatic sense of verticality, with four cantilevered office corners and an aerodynamic building form that, along with a canopy entry, mitigates street-level wind. Within the building, slender columns distributed along the building’s perimeter allow for panoramic views of downtown and the Rocky Mountains. The broad canopy at street level shelters visitors from inclement weather.

707 Manulife
© Tom Harris
707 Manulife
© Tom Harris

The tower’s orientation and narrow, elongated shape open the site to establish new public plazas on the building’s north and east sides. A two-story winter garden brings the rolling Alberta prairie inside. Connected with the surrounding neighborhood and to the city, the building includes second-level retail and restaurants, a fitness center, and a conference center. An installation by Chicago-based artist duo Luftwerk, adjacent to the LRT station, enhances the northern public plaza.


Making new connections

Calgary has one of the world’s most extensive networks of elevated pedestrian pathways. The skyway system, known as “+15,” spans nearly 16 kilometers to connect dozens of buildings within the downtown core. SOM’s integrated team designed a new pedestrian bridge to connect the Manulife tower to the existing network, while creating a unique architectural expression for the project. With a total length of 82 meters, the bridge features an elegant structural system known as a suspended lenticular truss, spanning 29.4 meters.

707 Fifth Manulife
© Tom Harris

Making new connections

Engineering the pedestrian bridge

The pedestrian bridge at 707 Fifth – Manulife Place is located at a vital juncture in downtown Calgary, serving as an important link in the city’s elevated network of pedestrian pathways. The bridge consists of a total of five spans: two end cantilever spans of 8.5 meters and 8.6 meters, two side vierendeel spans of 17 meters and 19.1 meters, and a central signature span of 29.4 meters, for a total length of 82.6 meters. The structure is supported by pot bearings attached to steel bents roughly 5.5 meters above grade that straddle the adjacent service alleyway. The simple and clean architectural enclosure allows the structure to become a prominent visual feature of the design.

707 Manulife
© Tom Harris

The challenge of providing a seamless connection to adjacent buildings, while managing subgrade conditions, installation sequences, and non-structural coordination, required innovative structural solutions to successfully deliver the bridge. The result has created a unique architectural expression for 707 Fifth-Manulife Place.

Cables were tensioned as part of a careful sequence, with the arch members installed after tensioning but prior to casting the concrete floor slab. All steel was fabricated to stringent Category 4 standards for Architecturally Exposed Structural Steel (AESS). The architectural cladding systems were designed to attach directly to the structure and eliminate secondary mullions. The bridge floor was pre-loaded before installation of the cladding to take out camber and minimize impacts on the cladding due to movement.

© Tom Harris
707 Manulife
© Tom Harris

Due to the structure’s sensitivity to temperature differentials, the project required a careful calibration of forces between the stainless steel cables and carbon steel frames to achieve a reasonable camber profile. Installation during sub-freezing temperatures could result in a higher camber than when installed during warm weather, due to the different expansion coefficients of the cables versus steel frames. Pot bearings were also utilized to accommodate thermal movements in service while improving the durability of the supports. Additionally, as the bridge straddles an active service alleyway, the bridge bents are secured by post-tensioned anchor rods to reinforced concrete pedestals designed to sustain a potential vehicular impact.

Due to the limited areas in the downtown core that could serve as a staging area, the bridge components were fabricated off-site then assembled in the adjacent parking lot and lifted into place on a weekend, requiring a road closure of only two weekend days.

To serve the tower’s full capacity of 4,000 occupants, the tower also integrates a Calgary light rail transit (LRT) station at the ground-level plaza, along with parking for 130 bicycles and 400 vehicles.

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