Here is an example of the loan summaries that I utilize for my Baltimore clients, being careful not to exceed certain loan-to-ARV and loan-to-cost limits.

These loans typically require a 20% to 30% down payment depending on the scenario and DO NOT allow for owner occupancy since it’s a business purpose loan, so you’d have to rent out both units.

Typically at least 20% for an investment property..You may be able to create 3 STR'S, bit you need to check your local ordinances first.

For the investors making money typically they figure out the strategy and location that works BEST for their particular situation and then go all in on that! 

Cost overruns are very typical with first-time flips, and I would strongly suggest any real estate investors, especially new ones, have access to additional funds if they find themselves going over their budget. 

The last example was a real whammy. 

For example, how much will they lend, at what interest rate, term, and costs.best wishes! 

Example (2) duplex's equal 4 doors you would simple include a SFR - single family to have the full 5 doors.

However, I would appreciate further clarification on what you mean by having a Plan B, C, and D.In my experience playing the BRRRR game on a smaller scale, typically with homes valued around $200,000, I have found that it can be challenging to generate significant monthly income, Instead, the focus is often on building a portfolio without having to make substantial out-of-pocket investments, which is indeed advantageous.

Mario - Taking a "paper loss" because of depreciation is typical from my perspective.