There are already two important buildings - the castle and temple. Also important landmarks like piers, parks and squares.

What I suggest are 2 further types, perhaps given as option of "Other types buildings',

1. Quadrangle buildings - prisons , barracks, college, monastery etc. Perhaps reroll geometry, so get more, or less rectangular, with different thickness size of each side of Quadrangle.

2. Oval or circular buildings. with or without central space. perhaps reroll geometry could work here too.

Cheers, Quenten