The only things that tells if the missing buildings are a Scenery Library issue or not, it's to check if the Addon Manager menu shows.
Do you see FSDreamTeam listed with publishers, with the ZurichX page, in the Addon Manager dialog box ?
If yes, it's surely something related to another scenery in conflict. If not, you have probably deleted some files by mistake. In this case, uninstall Zurich 1.1 and reply YES to the question "Do you want to remove Addon Manager". Note, only Zurich 1.1 uninstaller asks this so, if you have Zurich 1.0, please update it first. When the whole scenery, including the Addon Manager, is removed, reinstall. It should fix any missing files.
Another thing: buildings shows up only at complexity level 2 onward, meaning at least "Normal". They don't show at Sparse and Very Sparse.