So I forgot to enable asset compression in unity when creating the parking lot asset... Also apparently I had corrupted my Asset Creation Unity file a while a ago, now shadows are actually cast on the asset without the need of the UnityAssetVamifier plugin ?
Additionally I finally understood how to up the quality of shadows using lightmaps correctly and remade them for the parking lot (still not really noticable, but good to know for coming scenes)
And apperently when working on a scene for a period of time, the exact positions of atoms change, making the animations of the scene a bit less accurate. I corrected them from an older file of the scene, hopefully the dick doesn't flop out of the milfs hand/mouth as often now!