I am searching for building/property data which include building height, building area, lot size, and building type classifications(preferably as complete as possible). I am working on an Earthquake Model for highly urbanized locations, especially those around fault lines.
Maybe a possible approach few cities have 3d models for many of their buildings in google earth. Perhaps you can check whether these can be downloaded and used in another tool?
CityGML is an approach to provide such a data in a more standardized way, but I don't think they have much data available. http://www.citygmlwiki.org/index.php/Main_Page
Here is one approach to try and find building heights.
The idea is to download the open street map building footprints dataset. Got mine from here: http://download.geofabrik.de/
Download lidar data from here: http://earthexplorer.usgs.gov/
Do a spatial join with the lidar points on the building boundaries
Find the max height of the points for each building.
There was a previous question (Finding footprint data for US buildings?) just regarding building data. In the USA, Massachusetts has both building data and lot outlines (I'm not sure about building type classifications).
I would also explore OpenStreetMap as perhaps this data exists for some countries.