What is the best way to do the following....

I have two offices separated by a parking lot. Office one has a server that has all the drive shares, and has a FIOS line. Office two has a DSL line, and needs access to office1 for access to the drive shares. I have two wireless access points that have the two offices connected, and IP's being issued by the server in office1. Can I set office two on the same IP range of office1 and have the DSL line in office2 be the Internet traffic for office2? So that they can share drives in office1 but get the Internet from their own DSL.

Thanks in advance.