Invention #523  - New Baxter Building Configuration  (FF vol.2  #6)

With the destruction of much of the Baxter Building during the recent joint Kree and Annihilus invasion, Reed took the opportunity to make changes to the Baxter Building configuration when it was reconstructed.  (See invention 480)

Some of the new features include aquatic habitats for the “fish kids” and the mysterious Omega Room, which according to Reed is the safest place in the universe! (see invention 492)

http://marvel.wikia.com/Baxter_Building