There is one street level GV in building 48 that is HA. There are also 2 GVs in building 63 (elevator building), with one of those being HA. All the other 24 GVs at OKW are second floor entrance. I would have MS get you in touch with special services when you make the ressie so you can be assured of an accessible GV. The other option is to try for one of the SSR units, since they all have elevator access.