Home inspection: Significant active termite infestation; rotted wood behind vinyl siding. What's next step?

As part of my purchase contract I have spent 0 for a thorough home inspection of a duplex. Now that we learned of the termite infestation and wood rot, you'd think i'm out of there, but I'm still interested in the property IF, IF I can be sure to ELIMINATE the TERMITES & determine the extent of damage, and get ALL the rot taken care of at the SELLERS EXPENSE. How do I proceed?

Am I expecting too much? The seller seems to be prepared to correct the problems -- What's he best approach since we don't really know yet the extent of the damage.

will professional termite treatment really eliminate ALL termites currently infecting building, and keep new from attacking for a particular period of time?

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