AoE2 Connections Quiz - Week 13

This week's theme: Buildings and Upgrades

How to Play:
Connections requires you to make 4 groups of 4 items. Groups are created one at a time by clicking on 4 tiles and clicking submit. Wrong guesses will take away from your 4 hearts until you run out and the solution is presented.
Items can fit into multiple categories, but all of the items can only fit into all of the categories in one way. Thinking ahead will help avoid mix ups.

Game Link: https://connectionsplus.io/game/IL2zeM
NOTE: Imperial Upgrades refer to clicking to the Imperial Age and reaching Imperial Age, not a civilization's unique imperial technologies that are researched in the castle.

https://preview.redd.it/ogp846au7iee1.png?width=810&format=png&auto=webp&s=58464d8597688a941378a90b761664eeb6c89111

Feel free to paste your results in the comments and use the spoiler tags > ! spoiledMessage ! < (just remove the spaces between the marks) if you have any questions or feedback. Enjoy!

Hints:

  1. Free techs.
  2. Great view from here.
  3. Upgrade and then some.
  4. Repair with ruthless efficiency.

Previous Week: https://www.reddit.com/r/aoe2/comments/1i1rmxw/aoe2_connections_quiz_week_12/