A good one to start with is 30 North LaSalle(
link). It's a simple box. All you need to do is make one side, which can then be copied to all the sides. You don't need to do a roof.
Another one is the Unitrin Building (
link) which has two sides which would be copied over to the other two. You wouldn't have to do the sign.
The third is
1000 Lake Shore Plaza, near JHC. It's another two sider.
The resolution for all is the height in meters times 2. The width doesn't matter as long as it doesn't exceed the height.
BTW Here's a test shot of a night lighting system. I'm not sure if I'm going to pursue this, but I'm testing the settings should I want to in the future.