Unusual situation/ Request input

[Chad Anthony]

Looking for some input on a unique situation.   My brother is looking to unload his portfolio.  It consists of 21 doors, (4 multi family properties and 4 single homes).   There’s one loan with a balance of $480.  We strongly feel that appraisal value will top $900k.  

So here's my dilemma. The loan is in the LLC name with him as a personal guarantor. If I were to take ownership and assign myself as a new member of the LLC, would the current bank force me to refinance the portfolio?

My credit is average, how instrumental would my personal credit and finances be to get a LOC with the equity? To be able to build a bigger portfolio?

The properties are seasoned over 2 years. There's a $50k LOC based on using the appraised amounts at times of purchase on all the properties. But want to use the existing equity to acquire more, possibly do flips or BRRRs.

Any input is appreciated.