8/8 FREE, PROTECTED
buying a house is not required....but I would think it would interest you to do so so you can get insurance to protect you from the orange spaces with tree fallings, tornados, etc. I guess no one knows the ancwer to the original question
I'm pretty sure it is required - at least in the version I played as a youth.
See those deep red spaces - those are all required, whether you stop on them or pass over them. Buying a house is a red space.