For my answer, I'll assume it took years to save up the $80k, income is "normal" (meaning you are not making $500k+/yr), and you are moderately risk adverse.If those are correct, then first off I would not spend all the money.

Most fail to paper the contracts, indemnification and additional insured requirements correctly.

You are correct, that this has long been the conventional figure used to estimate cost for buildable sf in NYC. 

If I understand correctly, you're suggesting that we should focus on the big picture rather than getting caught up in minor details?.

correct and at new rates

I don't think unemployment is at all correct. 

I had my husband request membership to see if he can message the admin the correct information in that group.  

The remaining lone balance for house a is $117k, correct

mario,  correct on the math.Now for sure you need to rehab it.

And if the people you're working with aren't giving you the peace of mind that everything is being done correctly, send me a message and I'll get you taken care of.