That's not to say all properties will as it's very dependent on the property and the investors situation.

Ultimately, it depends on your goals and the opportunities available for investing your wealth. 

SO depending on your situation that might be the case as well!

Whether you classify it as business or personal income depends on the nature of the lending activity.

Best to involve attorneys/lawyers as well, but it depends on the type of financing you get.  

Depending on your financial status and the health of the LLC and investment it holds they may require a personal guarantee, which would also be you signing as your legal name.

They come with strings and fees so whether they are worth it depends upon whether you can live with the strings and have enough gain scale to justify the fees.I was looking at Delaware Statutory Trusts for similar reasons and opted not to go with them as most I've seen are incredibly inefficient due to massive internal fees which grind into dust much of the tax savings, so what would be the point. 

If you aren't doing it, you should use the average amount with the oil company based on other year's usage and they will average it so it's not $500 in one pop (depending how big these tanks are).

It is be difficult to answer in details on a post but I will give you some general info here as a guide:- The legal limit will depend on your location, layout of your house, and parking availability.

FULL STOP  Your ability to make such a profit will depend on your ability to manage the asset better than the prior owner.As a seller, the broker should be helping you determine the price point, at that time, that attracts enough buyers to achieve an optimal sales price.