City upgrades

City Upgrades are simply expansions to the city. Nearly everything that can be done in a city is considered an expansion. Selling land is considered an expansion, as well as building a castle in the city. These expansions all provide different amounts of Taxes. There are two primary types of City Upgrades, the functional ones, and then the tax related ones. Common examples of functional upgrades, are Warp Points, Nether Portals, and etc. Common examples of tax related upgrades are Jewelers, Tax Collectors, Watch Towers etc. A full list of all the upgrades can be found on the Cities page.