Once the basic surface of the tile was complete, I added some more bits to make the base a little more interesting. I decided to make all of the bits removable to facilitate easier storage of the base with my other terrain tiles.
Raised detail included indication of the guard rail that once surrounded much of the gas station's lot, a raised island for the gas pumps, and the original sign post for the station.
With a roadway tile that includes drives mating to the gas station lot, here is the final product:
Figs are 28mm Copplestone (I think).