So F2, F3 and F4 gives additional details about buildings, villagers and resources. There are more F keys that could be used and one of them could be to show a building type icon perhaps?
The manual way of identifying buildings is by going to the build menu and selecting the building you want to find. All existing buildings are highlighted with a white border around it. Think the Pub did not do this though. It would be nice if the highlight was not white but something more visible.
[UPDATE] Sorry, just checked and it does in fact not show existing buildings. I was pretty sure that is how it worked at some point, or I was just imagining it super hard XD
So something like this where the existing pub is bottom centre and easier to spot.
Additionally, a UI where you could select buildings and it highlights those buildings.
Cheers