Wireless bridge Question

Hi Everybody.

I hope I can clearly explain my problem.
I want to solve this with on hand hardware.

I have a firewall/router in a locked cabinet in the basement.
It's running OpenBSD 5.0 Current.
I also have some 2-Wire brand 1700 and 2700 series DSL
routers lying around.

I need a wireless access point upstairs, out of range of a
wireless card in my firewall/router.

I want to run a wired network connection from my firewall/router
upstairs to one of my 2-Wire routers to act as a wireless access
point.

BUT...
I want the DHCP leases to be handled by the wired NIC in my
firewall/router, and have the 2-Wire router ONLY act as nothing more
than a "bridge" (if that's the correct term).

Is this possible?
                              Thanks for any input,  Ed