I was curious to see if the data exists for Prince George, BC, and it turns out, it does (PG Open Data Catalogue, buildings download)! I’m not 100% sure if this dataset was created manually or through automation, but I’m impressed with the level of detail.
*note: there are over 30,000 buildings in this dataset. It takes about 30 seconds to load, for me. It may not work on your mobile devices.