Office suites

So, like many people, I work in an office suite, number 300. My office is 305, in a row of offices from 301 to 305. Pretty straight forward.

The next office down from me? 310C. After it? 310B, the conference room. The next actual office? 310E.

The restrooms don't have numbers on them, but inside the men's room is a closet that is 314A.

Da fug?