Alex H. Bonnar, P.E.

Associate Principal Boston Office

Mr. Bonnar has been working at the Boston office since 2004. He focuses on projects that require complex and challenging analysis and design across all market sectors. In addition to structural design work, he works closely with our internal MACRO Workshop to develop new analysis and design tools to enable our engineers to analyze, design, and optimize structures quickly and efficiently. He also serves a key role in the technical training of our younger staff. Alex is a member of the Boston Society of Civil Engineers Outreach Committee, which organizes events and competitions for K-12 students to promote and raise awareness of the civil engineering profession.


Northeastern University – M.S. in Structural Engineering
University of Massachusetts Amherst – B.S. in Civil and Environmental Engineering

Professional Registration

Parcel 12, is a 545,000 SF mixed-use development consisting of two towers set atop a platform over the Massachusetts Turnpike and Massachusetts Bay Transit Authority (MBTA) Commuter Railway. The 21-story office building and 14-story citizenM hotel share a two-story podium containing 54,470 SF of retail, deemed Lyrik. The 320-foot office building includes 295,000 SF of office space. The 170-foot hotel consists of 380 guestrooms within 129,655 SF. A 20,000 SF rooftop terrace sits on the top of the podium for the office tenants and hotel guests. The site offers 150 vehicle spaces in a two-story below-grade parking garage. The project renovated and reopened the Hynes Convention Center MBTA Station stop and a pedestrian tunnel, improving the streetscape, access, and safety.
One Congress Street is a 43-story Class A office tower that is the anchor of the Bulfinch Crossing renewal. The 600-foot tower has 1,000,000 SF of office space. The façade is completed with a curved and gently tapered design and glass-and-steel curtain wall, contemporary in spirit. A one-acre private landscaped terrace located on the 11th-floor for employees is included, along with a fitness center and upscale food and beverage offerings. The three-story grand lobby and the additional 10,800 SF of ground-floor retail space associated with the building are integrated into a dynamic experience, connecting it to the streetscape of the mixed-use destination.
The James Mandell Building is an 116,000 SF, 10-story urban infill project that added 44 inpatient beds and clinical support facilities to Boston Children’s Hospital. The structure’s footprint sits only 55% on grade; the upper eight stories of the building are cantilevered 65 feet over previously existing operating rooms, an ER and ambulance bays that remained open for the duration of construction. In order to create patient rooms that provided the same quality as the existing hospital beds and light-filled floors on a constrained site, a central courtyard referred to as a “hanging garden” was suspended six stories above the street, doubling as a quiet oasis for patients, families, and staff.
The Alcott (Garden Garage) is a 44-story, 447-foot residential building in Boston’s West End. The structure was built on the site of a previously existing 650-space garage, which was replaced with a five-story below-grade 830-space garage. The residential program consists of 470 units, accompanied by 20,000 SF of common resident amenities. Along the ground floor are 2,300 SF of retail space. In addition, the sidewalks and landscaping were improved in the surrounding area.

Additional Representative Projects