Question on how to get a lighthouse to show up

Lighthouses in TS3 are not lot types or on lots (except in one of the console versions, but those are different). They are CAW assets. If you or someone such as the world designer moved the lighthouse in the regular World Editor, not in CAW, this will tend to happen as the building may move or disappear while the light effects stay put or the other way around.

There may still be a solution for this, but I think one would have to dig into the world design with CAW or SuperCAW.

Paging @Rflong7 :)