It seems that the Denver Rainbow Grocery which was changed to Wild Oats has been closed in 1998 and replaced by an Alfalfa's on Colorado Blvd.  In fact, most of the premies and even satsang moved out of the Colfax neighborhood.  I was there in the 90's on business and I stopped at the store and checked out the old neighborhood.  I was on foot and it was nighttime.  It was pretty scary.  It had gone way down.

http://www.bizjournals.com/denver/stories/1998/06/29/story6.html

Although, I know that Rainbow Grocery was further east at Colfax and York.  There might have been something where the Food Coop was.  I also thought that north of Colfax was a large multipurpose building where a coop and Divine Sales was.  I worked at Rainbow at Colfax and York I believe in the summer of 74.

What might have been at Colfax and Humboldt might have been Divine Sales.  There is an 'F' for facility at Colfax and York which was the Rainbow Grocery.

There were health food stores all over the place back then.

I lived on Marion St.