The Dungeon/Buydown

Buydown
Each part of the quest consists of a series of 3 pillars. The ouside pillars have 3 segments while the middle section has 4.

Buy All is the cost to buyout all remaning parts of the quest. only is the cost to buy out only Pillar 2 after Pillars 1 and 3 are complete.

Question marks are unconfirmed.