Typically, I BRRRR with ARV loans through a local bank for our investment properties, so I'm not up to speed on traditional mortgage rates.

@Kervin SimonSmall local banks and credit unions are always best for this

When this process started I offered the bank 80k and they countered asking for fair market value of 95k and stating that they need a net proceeds of 79,847.

It's been a huge source of education and inspiration for me and my husband on our REI  journey.As to next steps, I would recommend finding a real estate agent that you trust, and also start talking to lenders (banks, mortgage brokers, credit unions, etc.)

You're best option to get all these questions answered is to find a local/regional bank (local to where you want to build) and see what their appetite and offered terms these days for construction loans. 

Would a bank loan on the entire portfolio or would I have to get a separate mortgage for each property?

That is why I never liked buying from other investors or bank owned properties that charge too much in earnest money deposits.

The mortgage company / bank is Midland Mortgage. 

https://www.dallasnews.com/business/real-estate/20... https://therivardreport.com/usaa-bank-lays-off-265...

@Ryan Kinley, I have some success with a local bank in Columbus.