From Jeremy Tammik’s The Building Coder blog:
RVT Properties to XLS and Forge Accelerators
Are you interested in easy access to your Revit model properties?
Well, you can have that, and you can even do so without a need to install Revit.
The Forge Model Derivative API extracts a streamlined copy of all geometry, BIM element hierarchy and properties from over fifty file formats, and Revit RVT files are just one of them.