There is an "arrears" that has to be identified and paid out of pocket before the sale or the loan needs to be paid off in full. 

Would depend on the full situation though if that would be possible.

I am a full-time Real Estate Professional (Agent with almost all other income coming from active and passive RE investments).

Full application review is almost more important than lease review, as you are seeing.  

BiggerPockets is full of resources designed to help you along your journey, whether you are just getting started or a seasoned investor.

I can’t say I came up with the idea, I saw a landlord with more units than I have post that they offered the holiday discount, bug only to their tenants who had made all their rent payments on time and in full over the course of the year.

Seasoned investors using commercial DSCR loans for the refi are typically completing full BRRR's in 3-6 months.

I want to start to build my portfolio to a point that I can jump into real estate sales full time but still have some cash flow I can rely on.

I realize the RE world is vast and full of scams, jargoned underwriting, salespeople, and crooks.

It was written before the days of YouTube, so it's not full of the common nonsense where authors sell a course, send you to their website for downloads, or write a follow-up with additional "secrets" they forgot to put in the first book.Long-Distance Real Estate Investing by David Greene was another good one.