About

Quadrangle designs for the good of clients and communities.


We’re a multidisciplinary architecture, master planning, and interior design practice based in Toronto, Canada with projects spanning the spectrum of the built environment focusing on mixed-use, residential, retail, commercial, content media and other projects. We are also renowned for our expertise in adaptive reuse, sustainability and accessible design.

For 35 years, we’ve set ourselves apart through our creativity, business acumen and lasting client relationships.

We believe that beauty and business go together, working with clients to achieve thoughtful architecture and design. Relationships are at the centre of everything we do. We help our clients achieve their goals and foster a positive studio culture that feeds our passion for design. Regularly in the media, headlining conferences, and receiving local and global awards, we are collectively and proudly shaping the future of our built environment.


Quadrangle co-founder Brian Curtner passed away from cancer on 15 August 2015 at the age of 64.

Brian and co-founder Les Klein formed Quadrangle in 1986, and over the following 29 years, built a firm to a staff of over 140 and a portfolio of projects throughout Toronto, across Canada and internationally. Brian was a modern renaissance man, combining expertise in design and construction with an innate business acumen fuelled by his passion for people, golf, cars, travel and art.

Quadrangle continues to celebrate Brian’s legacy in city building, mentorship and collaboration through annual sponsorship of the Curtner Urban Leadership Program organized by the Urban Land Institute.