Click on start and hit city upgrades. There will be a list showing you what level your buildings are. Click
to select any officer cards you have obtained to give a bonus. There is a great, comprehensive card guide that shows you what mixture of cards give you what bonuses. I didn’t need to use those combos, and neither will you. Upon hitting level 5, you will now be able to buy every item in that said facility. You are not done yet! You must then fill that bar completely. You will gain a gold border around that building showing that you are finished. Talk to the specific facility owner once you do this upgrade to gain a special rare item. Always check the officer cards so that you can put the max amount of points on the buildings.