@Timothy J.
You said "The township says that before the home was bank owned it wasn't condemned."
I am a little confused. Is the home condemned now?
If not just get a renovation plan together with your construction team and go to the Building Dept. in the town the house is in and tell the building/code official of your desire to renovate the home to a safe and livable condition and obtain the building permit applications to start the project once you close.
Fannie Mae for me has allowed 7 day inspections although they have never renegotiated a price. I have to decide after the inspection if i want to buy at the price i originally offered fannie mae and they accepted or I walk.
As far as the open sewer permit application again get a abandonment permit application for the septic and get a price from a reliable firm.
If you have the proper applications filled out by qualified persons their should be very little to be worried about. Just make sure the property is not in a location that is needed for things like flood control and such where condemnation for eminent domain is possible (EX: flood zone projects)