You've made a great start. The city itself is very large with a few different structures. However, I would look into adding the details now, you have the baseline structures, but quite a few of them are without interior. Not only that, i'd look into narrowing down the smaller details such as down on the streets. Street lights, Cars etc. For the Builder rank this is the sort of attention to detail required. As a sidenote, i'd try and make the buildings solely done by you in the future, to keep things easier in terms of getting a rank.
Keep going though, but for now, rejected.
