|192.168.0.0/16 will give you the following network:|
Start IP: 192.168.0.1
End IP: 192.168.255.254
If your network is bridged across all included buildings this would work just fine.
I'm not sure I'm grasping your IP scheme though. Assuming youre two main PC's are located in building 1 and the other 6 servers (one each) in the other buildings and then multiple cameras in building as well. I think I would do something like the following for myself.
Building one (main bldg or central bldg)
IP cameras: 192.168.2.10, 11, and so on for each camera in the building
IP Cameras: 192.168.3.10, 11, etc
This way the 3'd octed would more accurately reflect each building location of both server and cameras. Since you have 254 IP's to work with per 3'd octed number, why not take full advantage of that. Of course you're going to document the heck out of your setup but this is how I would do it just to keep straight what's where with regard to building and IP scheme.
Since our default gateway (assuming you bridge this network throughout all buildings) is going to be 192.168.0.1, there's no reason not to use .1 as the server IP in each building.
Oh, since it's just the 6 buildings, I think if it were me, I'd use 192.168.0.0/21 instead of /16 That still gives you the required networks in the 3'd octet (ie: 0 through 7) to work with and you could always expand later by moving to /20 if you needed to. You don't really need a network with 65,000+ available IP addresses........lol :)
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.