You don't state the "issues", but with the economy tightening there are all kinds of people in trouble financially looking to move in with friends - not necessarily a bad thing, but all parties should go into the situation with their eyes open.

The the regulations tightening and the little amount of motivated sellers I found made me stop. 

This is encouraging more building and rehab, which puts strains on supply. 2.

In CA, the Ellis Act will be used more frequently, and that will further tighten rental supply.

I suppose negative consequences could be another covid or something and banks tighten up and you can't refi your BRRRR. 

According to Bank Rate, interest rates have hit short-term highs, tightening cash flows and making qualifications more difficult.Source: Bank RateSingle-family home (SFH) marketBut the SFH market is showing no sign of slowing amidst record demand and low supply.

“In theory, a steep uptick in inflation would force the central bank to tighten policy by hiking interest rates or slowing the pace of bond purchases,” said Matthew Speakman, an economist with Zillow.

They tightened the law in a series of laws in 2008 so that now you only get to prorate the gain between the time used as primary (tax free) and rental (you'll pay tax on this portion). 

I got a card for my LLC the first week after closing it was from my regular bank a few years ago so regs may have changed or tightened.

@Tony Hershiser this is definitely a difficult situation and I know that it can really be a mental strain.