The DSC-PC4020NK MAXSYS is a 16 zone alarm system that can be expanded up to 128 zones with expansion boards. This system is for larger homes or, ideally, for commercial uses in businesses. The MAXSYS line was intended for commercial applications that would require having a system with access control, security, and automation all bundled into one convenient package.
Not only can you connect hard-wired devices into this system, but you can add wireless functionality to it also through adding a 64 zone wireless receiver. The MAXSYS is powerful and, besides having enough room to add a good amount of hard-wired and wireless devices, can be partitioned out to a whopping 8 partitions. This means that you can make certain parts of your location their own seperate arming/disarming areas.
You can also have up to 1,500 user/card codes which definitely puts this in the commercial class of systems. Manage the coming and going of your employees and assign them any of the 64 user access levels if they need different clearance levels.
All in all the PC4020 has what you're looking for if you need to secure your commercial building!