Gst registration out of state

One of my client taken registration in telangana state and he doing business under Architech designing works and he also wants to establish his office in bangalore my question is that shall he take another gst licence in bangalore or just telangana state gst license is enough. and the owner from bangalore asked my client gst number for giving gst invoice to my client for taking the bangalore office on rent.In this situation shall he give telangana gst number. if not then what is the solution.