Multiple Airports on Office Building network

I work as the IT support for a local office building.  The office provides internet services to the tenants in the building.  Most of the offices are occupied by doctors or lawyers.  A few have Airports Extremes or Airport Time Capsules.  Right now they are seutp on the buiding network with Static IP's and they seem to be acting as pass throughs to the building network.  So, they have their own wireless SSID's however the IP's they provide are really provided by the building DHCP server (XTM Firebox), which is the router.  The building is on a 10.0.20.x subnet
Whenever i try to setup DHCP on the Airports and change the subnets to a 192.168.x.x range, i get an error message that tells me the IP addresses are out of the subnet range and are invalid or something like that.
How do I provide a static IP from the building router as the "Internet" or WAN IP for the Airports AND have each Airport provide its own private subnet so that each doctor or lawyers office can have privacy and security?
Thanks
GCal01

How do I provide a static IP from the building router as the "Internet" or WAN IP for the Airports AND have each Airport provide its own private subnet so that each doctor or lawyers office can have privacy and security?
The closest way to do this would be to configure each AirPort to have DHCP and NAT enabled. This would provide each office with its own subnet, but would introduce a double NAT condition with the building's router if NAT is enabled on it. You would also configure each of the AirPorts with static WAN IP settings instead of being DHCP clients.

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