Clockwise, around the circle, from the upper right:

Axel F, F-word = F

4-H, Preparation H = H

iPod, I-beam = I

In-N-Out, Sweet-N-Low = N

The other groups:

A-Team, A-Bomb = A

Toys R Us, R. Kelly = R

Sunny D, D-Day = D

E-mail, E. coli = E

N-Gage, N Sync = N

B-flat, B-52 = B

ARDEN B. is a shop on the 3rd floor.