Determine what IP address your work DHCP server is assigning your PC.
Set your LAN settings for static. Enter IP address and subnet mask only. *No gateway address.*
Configure your printer settings for IP printing. Add printer, Local printer, TCP/IP (enter printer's IP address).
Enable your wireless connection and enjoy.
If I lost you with the terminology, then it will be easier to just plug the LAN cable in when you want to print.