I was able to extract and write to Property set definitions with lisp. I was using Civil 2017
But only after I had installed Autocad Architecture 2017 (trial) the lisp continued to work after the trial had expired.
My solution was more of a workaround. Hopefully they have started including the COM interfaces I was using in later versions.
Let me see if I can dig up my lisp.
I'm interested if anyone has a better solution to red/write to property set data.
Cheers, Rod