The Chamber of Commerce building occupied the half block on the north side of SW Stark between SW 3rd and 4th Avenues. You can see it nearing completion in 1892 in this Portland panorama of the same year; it’s just to the left of center with all the derricks on its roof. Economic difficulties, taxes and maintenance dictated its demolition in 1934. The site remains a surface parking lot to this day.
If this building had survived the mid-century bulldozer blitz, I’m sure it would be a treasured landmark today.