Looks good. To confirm, these are just references for what is possible to build?
Are generic city 1 and 2 different options? And main building 1 and 2 are different options corresponding to them? In that case, city 1 and main building 1 look better. Though for the main building it may be worth considering one that's not necessarily so tall.
I think city 2 is too cluttered - should look more organized and with more blue/water.
For the monorail, P18/P19 look good. But would there be a way for that to look more plain? Preferably it doesn't have a blue stripe/line on it. Maybe windows also just white instead of black. If we are showing the columns that hold up the train rail, maybe those can be more sleek and slender.