Watchtower

Watchtower
A Watchtower flies your flag, is a safe place for your patrols, and establishes your power on the frontier. A Watchtower cannot share a hex with another Watchtower or improved version.
Terrain: Any land.
Effect: Stability +1, Defense +2; Unrest decreases by 1 when completed. If this hex becomes a settlement, this improvement counts as a Watchtower building.
Cost: 12 BP.
Special: Units may be garrisoned in this hex and only pay monthly Consumption.