This includes properties still on there only hours from auction start time(delayed updates to the clerk of courts site).

Electrical would be minimal when the work is done but the rental unit is empty because you're likely talking about a frig plugged in and porch lights on at night (and perhaps a light or two inside on a timer) to give the impression someone lives there for security reasons. 

I moved out here with very minimal belongings into a furnished studio apartment.  

Should I grant the extension, but lower the purchase price offered due to the delay?

A competent contractor can take a walk around the house and come up with something reasonably accurate very quickly with minimal time spent. 

Matt thanks for bringing to my attention the information about it being "owner occupant" and having to stay for a minimal of a year.

There is simply to much money chasing to few deals in the north east, bidding up the prices.If maximizing your cash flow and minimizing your risk is your objective, I recommend expanding your geographic search criteria.Good Luck,Alan

Weekends and holidays do not delay or excuse Tenant’s obligation to timely pay rent.LATE PAYMENTS.

Nothing stops although we may have some delays.

Without knowing a lot more about your skill level and the issues behind the delays and overruns, it is hard to know for sure, but it certainly seems that you need to strongly consider hiring professionals immediately.