UI indicaton for already built buildings in the "Build" dialogue

It would be great if there was an indication in the UI of the Build dialogue, that shows which buildings have already been built. Sometimes it can be a bit tricky to figure out which buildings I have already built somewhere.

Right now I would have to close the Build dialogue and hover over each building to see their names and then compare these with the names in the list of buildings from the build dialogue to see which ones i haven't built already. This can be especially hard for new players, which have not memorized all the faction buildings and their respective visuals yet.

A new UI indicator, that shows if a building has already been built, would help out a lot and improve the flow of the game.