The following tools are presented in Esri's 3D Feature Extraction Workshop.
- Extract Buildings and Trees from Classified LiDAR
- Requires ArcGIS Pro 1.2 or newer.

Example of results from these tools in 3D Scene:
http://www.arcgis.com/home/item.html?id=a87a4fc23130405996f29da6a6476682
Download the tools here:
https://esriis-my.sharepoint.com/:u:/g/personal/geof7015_esri_com/EbOcsJu-flVZHb_EqH4Kdu8BzDw7b0sdv8...
What you get:

These tools are still in Beta and are supported through this blog only.
Please leave any/all comments below and I will respond as soon as possible.
For current Supported 3D modeling tools out of beta please refer to the Local Government Scenes
Local Government Scenes | ArcGIS for Local Government
Example of Tool Interface:

