I used a pre-marked sheet from a collaboration with another urban sketcher, Janet Gerson, who sent me the digital version during the early days of pandemic in 2020. That was during the time when we were doing the Zoom digital urban sketch meet-ups. I saved a printed copy for when the right time comes. The workshop was just the right moment to use it. It took me two other quick drawing sessions for a second look at the same spot before I was able to call it a finished drawing. There's a short video of the workshop at the end of this entry.
The finished work.