help identify purpose of this strange building ??

[Erin K.]

My husband and I were out looking at investment properties all morning, as we are in the identification phase of a 1031.  We looked at a very nice brick apartment building. It has a nice, aluminum-sided, 3-car garage behind it and also this strange building.  Realtor had no idea what it was for and we couldn't come up with any logical explanation.  My husband hypothesized that they had leftover trusses and block from the garage and just stuck them here  - LOL.  Anyway, just wondered if anyone has ever seen anything like it and any idea what it was used for.  Realtor said current owner's dad built everything and the property has only ever been used as apartments (although it is zoned commercial we think.)   So....I am curious what it might have been intended for, and - more importantly - figuring out how to make money from it if we buy it!  :)   Prob a little storage unit I guess. 

Thoughts?