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You need to change the IP Scheme of either your Sonicwall (Office Network) or the Access Point.
I would probably just change the IP Address of the AP. Login to your Linksys and change it into range of your Office Network : ie: 192.168.0.254.. From then on, you will be able to login via your Office Network.
Make sure you turn off all DHCP on the Linksys and let the Sonicwall handle all the DHCP requests.