Welcome to the world headquarters for Monolith Industries, makers of all things tall and square. At the time of construction the current CEO was a bit of a visionary and thought that one of the corners of the structure should be rounded off to create some interest in the building. Unfortunately, the board of directors were stuck in the past and while the design went on, the CEO didn't.
I usually only have one building at a time that uses those bricks(there has been a total of three different buildings). If I had to guess, probably 2-3 thousand (the total has gone up since this building was built.)