There were no building entries that were totally destroyed. Only the name, city and other miscellaneous data were lost, but other elements of the database entries remain, such as the description field. However, for any building entries which were affected they no longer appear in the searchable database. But if you happen to know the URL of a building entry it can be viewed, such as -
http://skyscraperpage.com/cities/?buildingID=83301
Most of the building entries which were affected didn't have a drawing associated with them and still remain to be restored to the public database.