Where in Duluth?

I can picture the wall in my head, but I cannot place it....

Behind Arrowhead Place, 2nd and 2nd W?

Not behind Arrowhead Place.

Just outside Martinez's office ?  (sorry, couldn't resist)

Pioneer hall?

Not Pioneer Hall.

Piedmont Milk House?

Nope.

At the old NWA maintenance hangar?

Incorrect.

Damn it... this is frustrating me. 

I know that wall, yet my brain is not cooperating. 

Can we narrow it down to a region?

It is west of the Friendly West End.

Apparently, Martinez doesn't read PDD.

I've never seen it... but the rocks look familiar. Is it the Faith Haven Apartments on Grand Ave?

It's a half mile away from Faith Haven.

Is this in the parking lot adjacent to Central Sales?

More accurately,  on the side of the building that faces the parking lot adjacent to Central Sales.

It's not in the parking lot by Central Sales, but the guesses are getting closer.

This one is too easy to not solve after five days, people. The previous guess was within 1,000 feet.

That is the thing, it is in my head and I knew the general area it was in, but nothing matches. 

Granted, I am kinda cheating by double-checking google maps to see building facades...

My first thought was either the wall by Central Sales, or the wall by that dental office near McDonalds, but neither match up.

Just a guess.... Ramsey Manor

You're getting colder.

I think I've got this one. I'm pretty sure its on the backside of the Spirit Valley strip mall, (I'm sure there's an actual name for it that I'm blanking) facing the interstate, somewhere near the door to what used to be Washboard Laundromat.

Beaner's parking lot, or the parking lot next to the Grand Ave Vet/hair salon?

Chad S. has it! It's the rear of the Spirit Valley Shopping Center. I think this parking spot in particular is associated with Lake Superior Physical Therapy.

Dag Nabbit.