upgraded the slay belle building to level 7 and then sold it. had almost two weeks to concentrate on previous buildings. so i upgraded my 2 level 6 transtech buildings to level 7 and got my 2 level 6 dockside mills to level 7.
those were easy to do but i just paid a freagin billion for upgrading one of my level 7 dockside mills to level 8 ... jeez, costs a hell lot lol
so, which building are you upgrading right now?