Farm Bureau does a great job of allowing folks inside. They exist to serve their customers, so making the entrance accessible certainly brings in more customers and therefore more money. After all, isn't that why businesses exist?
Parking is easy, the ramp has a railing. They do miss a bit on the door because it is not self opening and there's about a one inch threshold. That can be difficult for manual wheelchair user. Most of Mountain View's buildings this way, I find.
I give Farm Bureau a 4 rating only because of the difficulty with the entry doorway.