good trick you can do if you dont really want them to see it is uh... build them somewhere else and dont give vision to yourself... and then make place like 7 give vision to you and create map revelears all around the place expect dont put it where you put thoes buildings

that takes a little time but it works if you really dont want them to see it
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Yeah that would work but you will still see your buildings in the fog of war. The trigger doesn't fire very quickly. So you will see it full vision for about 1 second then it will go in the fog.