It is also about security.

If the new buyer defaults on payments or otherwise breaches the terms of the mortgage, it could impact your credit and financial situation.Market Demand: Consider the market demand and potential buyer pool for properties sold under subject-to arrangements.

(Q3)Security deposit is another area that I need clarifying on.

For this, I need intelligent lawyers who understand creative deals, are ethical & secure their client’s interests.

It's all totally survivable.It will take 90 to 120 days to go through the process and then you can start rebuilding.Banks won't lend to you in the future until you clear the deck and rebuild your credit anyway (usually through small loans at first and secured credit cards.

When done improperly, as so many people do, an LLC is just a "security blanket"; it gives you the illusion of safety and little else.

We're not sure how to handle the security deposit.

In other words, secure funding privately or secure funding commercially? 

Our typical strategy is to purchase and renovate a property with cash (or Lines of Credit), stabilize it with good renters, then eventually refinance on a 30 year conventional for a more secure, long term investment hold.

TR-31 (new mandatory security) requires substantial cap ex to meet regulatory requirements.