Shapefile Unit Issue in Heron

Hello All!

I am trying to extrude building heights from the GIS data importer plug-in, HERON. I downloaded a .shp file for Redmond, WA and I am not sure what units the building heights are in. The buildings are much taller than they should be. I tried converting them form Ft to Meters (multiplying by .304) and the buildings were still about 3-5 times taller than they should be. Any help would be greatly appreciated! I have attached the shapefile folder to this (4.2 MB)