Factory #28 Buicks On The Roof

Here's an interesting detective story I found on line plan 59. Long story short, these factory publicity photos from the 50's intrigued someone enough to blow them up to see what was reflected in the chrome. The Elevator for bringing these cars to the roof was built at the same time as this structure, at the southwest corner of #28. I have no idea why this odd little shed had two different roof heights, that's another mystery.