‘The only instance I can think of where the passive investors don’t retain further interest in the property would be if they are note holders and not equity owners. 

Even inside a wall when investigating pipe leaks!

They also do not retain any information past 60 days.  

The fours walls of the basement are cement, and for now I will leave them as is.  

So whats the reasoning behind landlords using white paint for walls?

Cash out refis on non-owner occupied properties is like looking for hens teeth.For new investors, or small investors, it's what I call hitting the wall.

Get off the wall, meet people and let them know what you are looking for and what you are doing.

Think of the LLC and other work you may do with legal and financial advisers (such as attorneys and accountants) as your "castle walls and moat" around your assets, personal and otherwise.

Example, if I have a warehouse with two bays, can I erect a wall and divide it?

And you have to retain the bottom portion with info about what you did with the letter.