I have grass that is in the wrong spot on my map under a building that is coming up from the floor. Is there a way to remove the grass in those parts or do I have to move my building?
The easiest way to remove the grass is using the grass brush in the terrain object .
If you have dynamically placed buildings that would require custom scripting to get the gras data updated correctly at runtime. (Removing grass from a terrain in Unity | Independent Software )