Finding one's way around Cummings Center will always be a whole lot easier with just a rudimentary idea of how the suite numbering system works.

First of all, the very first digit of each suite number always reveals the floor on which each suite is located, from one to five. Then, the second and third digits effectively reveal how far south or north each suite is located, with "01" being the farthest south. Franson Chiropractic, for instance, is Suite 101-C. It is therefore on the first floor at the extreme south end of 100 Cummings Center, closest to Elliott Street. Hamilton Thorne Biosciences, on the other hand, is in Suite 460-C, which means it is on the fourth floor near the extreme opposite north end of Building 100.

(The structural columns in all buildings except 500 are located 20'-0" on-center each way, beginning with column "01" near the south end of Buildings 100 and 900, and ending in Building 100 with column "66" near the far north end.)

The fourth element of each suite number, of course, is an upper-case letter. These letters run from "A" through "Q" in Building 100, and from "R" through "W" in Buildings 800 and 900. All of these letters designate each suite's position on the east-to-west grid. All units with addresses ending in A, B, or C will mostly have their entrances from a hallway along the far east side of Building 100, along the railroad right of way. Suite numbers which end in any letter between "R" and "W" will be found in Buildings 900 and 800 Cummings Center. A few suite numbers ending with "X," "Y" or "Z" will be in 600 Cummings Center.