Towncenters is the main production of units,techs and train house of a worker.
So you know Towncenter? you see the towncenter?
My opinion is the current design of town center is look like humans' structure. My wish is if you captured the towncenter it should be change not only the team color will be change, also the towncenter will be changes and depends on the type of the race.
(e.g.:
-orcs: towncenter look like round shape and wooden and spiky
-humans: not changes
-elves:a big tree with face (yellow neon eyes/monster face but calm face) and mossy hard wood.
-....)