The headquaters of the Assassins guild is extremely valuable, it means all my assassins start with 4 eyes normally(I think my king has a retinue member that boosts assassins. Gets rid of the crappy early training and 2-3 kills later they have max stats. As the Venician family have found out to their cost(and a couple of popes, screw elections, they vote the wrong one in then kill him (44% chance for a newly elected pope and a perfect assassin).