Running out of Ip addresses

Our current network setup is one single subnet, with a class c subnet range 192.168.1.0/24. We have a second building that we have ran cat 5 cable to, this second building. We are running out of ip addresses, and would like to make this second building use 192.168.2.0 ip range. We dont want to change our current ip range or subnet mask if at all possible. What equipment, etc, will we need to accomplish this?