The parents refuse to help, she's making enough money to get her own place, she ends up alone, isolated, ostracized, and in a very brittle place.

Second, in terms of asset protection, as some have mentioned, LLCs are not invincible, but I think what many don’t understand is that they are not designed to completely shield your assets from liabilities, on the contrary they are designed to contain and isolate liabilities.

You are coming from a negotiation point of weakness to a holdout who is like indifferent to your situation and unlikely that your sales skills will convince him to sign, especially if he’s isolated and has substance abuse issues.

Which doesn’t mean I solely work with “Investors” but rather I want all of my clients to view their real estate purchase thru an investment lense.

I don't know how you file taxes, but talk to your tax professional about what you can do to isolate your dealer operations from any LTR activity you may pursue. 

Are you saying wage inflation won't be much, that this is a more isolated incident? 

So, the answer to the question depends on the time period and location (and whether or not inflation adjusted prices from the past ten+ years will hold up long term).As you stated, the benefit of using leverage to multiply the impact of appreciation by 2-4x is not isolated to real estate but many of us consider that benefit inseparable from the benefit of real estate appreciation because of the readily available financing, the small initial investment needed, the passive nature, and the resulting high multiples (10-20x) of real estate...all compared to other direct owned businesses that are achievable for the average citizen. 

You can encapsulate the paint and isolate with metal winterizing copper.

Big mistake, the old dip tube fell into the tank and there was no way to add another one into the spot, so I put everything back together and attempted to isolate the tank with the valve in hopes that I could still get the water turned on to the rest of the house.

You want to keep them isolated.