Design a good network first to handle the requirements.
Maybe I can help you design a good network infrastructure to accommodate 180 IP cams.
I have few questions:
1. How many floors in your corporate office?
2. How many IP cams needed to install per floor?
3. What is the resolution the IP cams?
4. How many monitors needed to display live view of 180 IP cams?
5. How many windows per monitor to display live view of 180 IP cams?