The absolute best way to avoid taxes is not earn income.  

So, you can do a land contract for 12 months, which should allow lender to credit you full value of the land vs the purchase price, but the loan will pay off the land contract, so the lender maintains first lien position.Can't help you with the rest of your question, but you should be able to search for "CPA" here on BP to find experts to reach out to.

If you have extra cash at the end of the month, then do double up payments on the mortgages so the principle is reduced and this will increase your heloc room.

Do you know how to read the credit/criminal background?

Technically it would be best to get a C Corporate or S Corp. to flip properties and since you are considered a dealer if you do several properties a year and this could have negative tax consequences in an LLC.

Looking forward to your insightsThere are probably many ways to go from $12 million annually to $60 million annually.  

I'm have been asked to enter into a partnership with an experienced investor, and I'm not sure how to or the best way to structure a partnership.

When work needs to be done, we require the tenant to provide access.

Quote from @Scott Trench: Wait... the guy who buys all the ads (through Google) on BiggerPockets YouTube videos and attempts to reach BP viewers says that Tax Liens are the best way to build wealth, asking me repeatedly and agressively why I'm not doing it? 

After reviewing your application, we’ve determined that, unfortunately, we are unable to move forward with your application at this time, as it does not meet our established criteria for income and (other established criteria) We appreciate the time you took to apply and wish you the best of luck in your continued search for a home.