Synchronized terrain positions theory

So I have a client server set up for my game. The issue im having is that the movement and player position are synchronized correctly between clients and server.

However the position of buildings etc are not

How would you configure for example a wall so that its position synchronizes from the server to the client correctly?

iv'e included a diagram to further explain the situation encase anyone is confused

 

Well, how are you currently placing your buildings? You should either place them on the server and sync those placements to the clients (such as instantiate/spawn on server so they spawn on the clients in the same place), or if you place them randomly you could send the random seed the server used to the clients so they will be placed as the server placed them.