So, today I was poking around and figured out how to access the In-Game Lot Editor.
Upon invoking it for a new lot the game jumps to the north west corner of the city tile. The first thing I did is adjust the Lot Size:   I selected 3 x 3:   Now we need some textures:   Refresh the 3D view to see how it looks:   I rearranged the textures outlines better (tho the editor seemed to figure out they need to align on the cell boundaries). Next I selected a building family:   I plopped it randomly:   Then I moved it:   Click Add New Flora from the menu:   Select a random flora family:   I plopped a bunch on the left side:   Then I moved some of the trees around and selected Cycle Lot Condition:   Now it's distressed:   Cycle some more and it's abandoned:   Attempt to save and no go:   But, it can be saved within the city tile:   So, it was an interesting experiment which prolly has no practical use at all.