I've seen BPOs around $100-200 when prepared for a bank compared to a typical appraisal that goes for around $500. 

Then saving the extra money for an emergency fund as well as your next down payment is much more important.Also when you go to get the second mortgage the bank is going to care more about you having reserves (more cash or assets that you can easily make liquid) than seeing you have paid down you mortgage some.  

He stated best price was $600k, but knowing he really want to sell, I only agreed to pay $470k (Seller brought building for $420k during 2010 from bank. 

I strongly suspect (without even seeing your loan docs on your personal loan), that transferring it to your LLC might trigger a due on sale clause and the bank could call your loan, if they ever found out. 

There are tons of local banks doing loans for flippers just like HML but at much better rates and cost.

Refi (Yes Dave R is spinning in his grave or I'm sending him there more quickly)  Refi and consolidate debt on one or two properties and then apply all cash from every source you got including banks you can rob and lunch money you can steal from your children to that one loan.Paying of debt is a very good goal. 

I discussed my position and explained that if everyone expected payment for an inconvenience then every tenant would insure an inconvenience every month.

@Monica LitsterAs @Jonathan Soto explained, it depends on the contribution from each partner.

How old of an appraisal will a conventional bank typically accept?

@Sandy Hu I used to have several with Bank of America but in the down economy they bailed on all of them.