Each fluctuates regularly so it's really just about maintaining that balance between the three as best as you can.

Combine that with the $10k we will have payed off over the 2 years on the balance, and the $10k back that we put into it and we should have around $55k to use towards our next venture.  

Dave Ramsey would say pay the smallest balance off first then the second largest, and on and on.

There is a delicate balance there.

Now, at end of job, the lender refused to reimbursed me the money I paid the new contractor, They are considering any amount in escrow as "unsused fund", and want to apply it to the mortgage balance. 

It doesn’t matter if your 1099 goes to your LLC or you directly.Talk to a CPA so you can properly log and track your expenses during the year.

I would be cautious of owning that many units in one association without properly vetting the financials of the association. 

My agent owns a few apartments so I'll receive proper guidance - I believe. 

They also aren't properly educated and have no idea what they're doing. 

If you know how to price properly,  complete and adhere to standard state PSAs, contingencies, disclosures and addenda, open escrow and prove you are financially qualified to buy, go for it!