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|colspan="2"|City upgrades are special buildings found in the Extensions tab of any house info window, added with the City Update of 2021. Different extensions get unlocked as you progress through the eras of the game. There are three main types of town upgrades: [[City Upgrades#Public|'''<span style="color:#0a0">Public Services</span>''']], [[City Upgrades#Relax|'''<span style="color:#00f">Relax</span>''']] and [[City Upgrades#Luxury|'''<span style="color:#408">Luxury</span>''']], and two special: [[City Upgrades#Constr|'''Constructions''']] and [[City Upgrades#Pollution|'''<span style="color:#B7410E">Pollution Zone</span>''']].Last, but not least, you can improve the visual appeal of your town by placing a few [[City Upgrades#Decorations|'''Decorations''']]
Houses in these '''<span style="color:#0a0">green</span>''', '''<span style="color:#00f">blue</span>''' and '''<span style="color:#408">purple</span>''' catchment zones will automatically upgrade to generate more passengers, growing the city. It does not matter which specific extension of each color you build - whether you want to build only Wells, or a varied selection of Wells, Markets and Saloons is up to you. You might find the latter approach more decorative, but the former works just as well.