http://www.greatbuildings.com/types/models/models.html
You can import .3ds into Archicad then save as .gsm if you want.
lots of sites like this on the web.
try something like this:
http://www.turbosquid.com/FullPreview/Index.cfm/ID/309382
http://www.turbosquid.com/FullPreview/Index.cfm/ID/239130
http://www.turbosquid.com/FullPreview/Index.cfm/ID/259721
http://www.turbosquid.com/FullPreview/Index.cfm/ID/257359/SID/259721/blFP/1
http://www.turbosquid.com/FullPreview/Index.cfm/ID/215653
ArchiCAD 25 7000 USA - Windows 10 Pro 64x - Dell 7720 64 GB 2400MHz ECC - Xeon E3 1535M v6 4.20GHz - (2) 1TB M.2 PCIe Class 50 SSD's - 17.3" UHD IPS (3840x2160) - Nvidia Quadro P5000 16GB GDDR5 - Maxwell Studio/Render 5.2.1.49- Multilight 2 - Adobe Acrobat Pro - ArchiCAD 6 -25