OK, OK! Time for another guessing game.

Two questions about the image below:



1) What is the building?
2) Where was it located?

I'll give a couple of starter hints:
(a) The above building was built before 1920;
(b) It was the 2nd building in its class that was constructed in or around Oklahoma City.

I'll add hints as needed; it will be the subject of my next history blog article.

Guess away!