Hi,
i was searching for some good block for free and I found this website, i would like to share with you.
It has over 200 blocks well organized by category (indoors, outdoors, vehicles, people, office etc.) and above all they are free and with no need of registration. There's also some pattern.
They also have a 3ds max section but i think it's under construction
Hope it helps
http://max-cad.com