Does the LLC legally own the property that was purchased? 

You are not allowed to compound interest.If you bought the certificate from the state on a best price offer, you charge interest on your purchase price, not on the full amount of the taxes that were due, but were not paid by you when you purchased.After you obtained your tax deed, you are entitled to something called "mesne profits" if you file an ejectment lawsuit against the former owner and they redeem during that lawsuit.  

Purchase price: $900,000 Cash invested: $15,000 6BB/3.5Bath 4000sf on 3.4 acres near several wedding venues.

To defer all tax you must purchase in total at least as much as your net sale.

Quote from @Juan Perez: Greetings,My first home was paid off over a year ago, and I am now living in my recently purchased 2nd home.

Or buy something that needs some love and some hard money lenders will fund up to 90-100% of the purchase and rehab.

If your income grows faster than inflation, you'll have the $162 needed to purchase the basket.

Yes quite a few of our 5,000 options have rate and term or purchase!

Do you have a track record of purchasing and operating real estate on your own?

If your mother does not want to carry the note long term, there are GSE renovation loans that can be used for both purchase, rehab, and permanent financing all in one loan.