BY David Raffetto

Thousands of people enter our Main Building every day -- some through the front door, some through a skybridge, some through a tunnel.

What many don't realize is that the Main Building isn't just one building. Currently, we're working on the 21st addition to the building, which has been around for nearly 70 years.

As you travel through the building, you probably pass from new to old to even older without noticing. But...