Sketched from reference photos I took on a week-long visit to Montréal in March, 2015.
The bright, mustardy yellow insulation exposed between the buildings was very striking, especially in the sunlight.
When I got home I discovered that Marc Taro Holmes had sketched buildings across the street from this in his then–recently-released The Urban Sketcher, (urbansketchers.org review) which was fun.
Pencil and Carbonpen fountain pen on 5 ¾ × 8 ¾″ Stillman & Birn Gamma (150 gsm ivory paper).