The databases I know of:

mystic-nights.com/directory/index.php

[www.whatever3d.com/

](http://www.whatever3d.com/)[poserpoorhouse.pbwiki.com/Holiday+and+Special+Freebies

](http://poserpoorhouse.pbwiki.com/Holiday+and+Special+Freebies)[www.sam3d.com/

](http://www.sam3d.com/) have little except for Sam3D's expensive turbo squid white house model, which is strictly exterior anyway.  Whatever3d does show the White House item removed from CP.

Shame. Sounded like you were going to do something exceedingly interesting.   And here's an example of a good item going missing when its needed later on.

Maybe you can find jpg's of the West Wing TV series and get an ideal of convincing interiors from that.