Exactly what the title says!
Say after a while you decide that you no longer want/need an ambulance or airport expansion etc - is there a way to delete and permanently get rid of the expansion? If not, then this certainly needs to be included in the game interface. Particularly if you wish to move the building, meaning you might not require certain things anymore
Would be useful, currently decommissioning my ambulance extensions as they're not realistic to the UK.