Laura, thanks for the offer!
However we had an internal discussion about this last Friday and decided to use the following:
1. Crawlspace: Elevation Label 21, Custom Settings | Label Content | Reference Story > Project Origin
2. Basement: Elevation Label 21, Custom Settings | Label Content | Reference Story > Current Story
We're not fighting the program then. Crawlspace labels will have a negative value dimension from main floor/project origin and basements will be positive from top of basement slab.
AC19-23 | Win10 Pro | i7-8700K | Quadro P600 | 500gb 960 EVO M2 | Dual 28" 4k Samsung U28E590