SATISFIED WITH THE SALES PRICE: I understand I may be selling The Property for less than market value but have chosen to do so because circumstances dictate that an immediate sale, even at a discounted price, is in my best interest.

Do I walk away or discount the offer (and how much % if so)?

It saves me the hassle of calling up dozens of less than motivated sellers to find the one listed property I could buy at a discount myself.

I wouldn't say my project is ahead of its time and there's no reason to discount the amount of money saved and earned by getting to occupancy faster, having less overhead and less general conditions overall. 

Robert Shiller did state as well though that investment properties can have tremendous returns.

I would say generally no more than a 10-15% discount off retail.

This way you can get the deep discount for the asset and then hopefully turn something into a reperforming asset for mailbox money.  

Maybe go to a local meetup and see if anyone needs any general labor...hands on experience can never be discounted...you get to learn what to and what not to do!

It's not clear why the property is being sold at such a discount.  30% LTV with a $42k mortgage means the value of the property is around $140,000 since $42k is 30% of that number.  

If you will give enough information for others to be able to know specifically what it is you are wanting answered, it will help tremendously.