I did all of mine several months ago as they are single member LLC;s and I already have to go through fingerprinting, background checks for my NMLS license as well as audited financials for our fund.

You also want to see a reserve study and only invest in a property where the HOA is at least 30% funded, less than that is assessment territory. 

By providing the necessary funding and covering renovation expenses, we ensured the project stayed on track and within budget, leading to a profitable outcome.

I would acquire in cash and then refi into longer funding. #4.

It is my understanding that people refinance and then use those funds other ways (personal living, investing, some to buy another property) as a means to minimize tax obligation. 

But when you got $40k, $75k, $125k, you're not gonna become a financially free anything via buying index fund's and ETF's, your just not.

If you create or fund an IUL instead of paying cash you can then get a loan on the IUL.

And I still finance land flippers all over the US.. so perk test and soil test we deal with every week on our funding's.

Most seller's in a sub-to don't understand the risk they are taking and most lenders have concerns over the overall portfolio quality ratings which has an impact on their cost of funds.

If you’re not willing to do this, then you may be best off investing in some kind of real estate fund concept.