For some reason I am unable to see your post on the Heron video page.  So I will respond here.

For the topography, have you tried this IMG file:
ftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/NED/19/IMG/ned...

And for the building heights, Seattle and San Francisco do include them, but I've found that not many sources do not. Have you tried this website:

http://gisweb.miamidade.gov/GISSelfServices/GeographicData/MDGeogra...