The Estate is a building that can be built in your castle in the Great Empire once you have achieved level 13. You can upgrade it to 3 levels. This building allows you to capture outposts from either the inactive state or from another player. If you have the men, it is recommended to capture an already functioning outpost to save your resources, but manyAlliances count capturing outposts as an act of war. If you build your own, capturing it near near your base allows accessibility as well as allowing you to send market barrows to it faster with the required Resources.