Since you have visually inspected and you felt conformtable to provide an offer, so it shouldn't be a problem for your living.
The only question is how you worry about the impact to the resell value.
You have appraisal now, you can choose back out, or renegotiate a new price based on the new fact discovered, subject you have appraisal contingency.
If you don't have appraisal contingency, you cannot do anything if you keep your integrity.