These businesses do not rely on pedestrian traffic. The cost of putting in sidewalks may have been left up to the property owners. Most inner city urban industrial/commercial areas in Vancouver do have sidewalks. However, here is one that has only partial sidewalks or no sidewalks.
https://goo.gl/maps/pUTQrSBs2SU2
https://goo.gl/maps/nHMx8M8V1RC2