In addition to creating a settlement on your own, you can buy an already existing settlement along with all its progress, armies and all other advantages and disadvantages. The only exception will be resources that will remain on the seller's wallet.
You can understand that the owner is looking for a buyer using this mark in the settlement menu on the map
Naturally, any player can independently lay out his settlement on the market and assign him any price that suits him
To start trading, you must transfer all necessary rights to the contract and set a price