BIM Standards - more about process than limits...
Notes from AU-
For designing models define the processess- eg- A sweep should cut the wall but not typically be embedded in the wall type. Sweeps should be modeled separately from wall types to limit creation of wall types.
Model floors for each level separately
In this blog there are several Process vignietttes which are intended for searching an use to work collaboratively with one another.
And another big tip I really would like to approach more often- talk to contractor about what they need in the model- what they would like to see -- Satterfield & Pontikes are able to turn around cost estimates on buildings in as little as 15 minutes once properly set up.