My loft New Haven layout consists of three levels.
The lower level consists of storage. It is the old storage tracks from my first layout moved down to a much lower level:
The tracks run up from the storage level to the lower level. They form a stacked figure of eight with both Os stacked above each other. The tracks cross over each other just above the hatch.
The upper level contains a city scene at the top of the plan with an elevated section. It runs round to the left to the peninsula with a car float and dock. Further round is the steam servicing yard and roundhouses.
A branch runs around from the main line on a steep incline, out through the loft void under the eaves and back out onto the upper level. This is a mill valley with a lot of greenery and trees.