Town Infrastructure I allows you to reduce the price of building upgrades in your Alliance members’ bases. Base Financing: Economic does this for Economic buildings, while Base Financing: Defense and Base Financing: Army reduce the upgrade cost of Defensive and Army buildings respectively. Base Financing: City Center reduces the cost to gain new Ages, helping lower level allies achieve more, faster! The last Law, Town Fortifications, reduces the cost of Wall upgrades, making it easier to upgrade large stretches of Wall at a single go.
Town Infrastructure I also contains a very important battle buff for Parliament: a ballista mounted to it! Named Parliamentary Defenses, this makes Parliament a powerful Defensive structure, adding to your ability to repel foes. It also upgrades with your building, getting more powerful with each upgrade you apply to your Parliament building!