It can be built by using the customisation button on the clan citadel interface, then selecting the hotspot at the town square. The resource requirements for the habitats are: * Basic - 3000 timber, Tier 1 Citadel * Medium - 30,000 timber, 30,000 precious bars, Tier 4 Citadel * Grand - 30,000 timber, 30,000 precious bars, 30,000 rations, Tier 7 Citadel