Empire Story

Max: 18 marketplaces at lv 73. No option to unlock extra.

Mastering:

1: 8

2: 15

3: 20

4: after another 40 collected, 83 total

XP per amount spent on decorations:

Varies: E.g.

Stone House 1XP per 50

most 1XP per 40

Basic House 1XP per 37.5

Straw Hut 1XP per 33.33

[color] Banner 1XP per 0.16G

Cows 1XP per 0.15G