I noticed this one last week when I was heading over to Atlanta Bread to see if they had pumpkin soup this year (answer: apparently not). Pioneer Machinery was on the West side of Sunset Boulevard in-between I-20 and I-26.
From the looks of the roadside placard, there were apprently several other businesses in the building, or at least suites for several other businesses.
I don't know anything about Pioneer but they were apprently in defense contracting and won contracts as recently as 2007.
If you click through to the high-res picture, you can see a lost-dog poster on the phone-pole. Hope he got home.