What reasons do you need to be at the office, do you need to be working on a computer they have there, or do you just need to be in the office? If the computer is irrelevant you can use remote desktop software to access your home computer from a terminal at work. You could also consider switching entirely to a laptop that you could bring with you.

If the reason you come in is that you need to use features of the network there (access files, network printing, ect,...) you could use VPN to connect your home system to that network and access the features you need remotely.