But that aside: What do you want to know? Properties are based on the template and whatever the user did. You can't "find" them... – you'll will need to look it up yourself. If you do not have it, create it.
There are only a handful of so called built-in properties (like the ID and the reno status). The rest are all user-defined.
Lucas Becker | AC 27 on Mac | Editor at SelfGDL | Developer of the GDL plugin for Sublime Text | «Furthermore, I consider that Carth... yearly releases must be destroyed»
And another question, I am using GetAllPropertyNames method of API and then just filtering them by type "UserDefined" and still It seems not all user defined properties are there, although they should be there, cause the data I've sent above is retrieved from the same archicad project.