Can I foreclose on Days Inn?

[Kyle W.]

I am new. To everything Real Estate. I'm almost done with the BRRRR's book, listened to over 100 hours of Podcasts and 40 or so hours on YouTube videos dealing with Real Estate Investments. I started by looking up any properties that owe back taxes so I may be able to find a motivated seller. Here in Cochise County, AZ... I fell in the rabbit hole.

I have been searching the entire county, looking at various properties that will go to auction Feb 19th. As I'm looking, I see Days Inn owes $73,770.28 in back taxes. This same property is for sale on Loop Net for $2,200,000. From my limited understanding of purchasing Tax Liens in AZ, my process would be to bid against everyone or anyone else interested in the property with interest rates starting at 16%. 

So in this fictitious scenario, I win the bid, pay the back taxes to the County, get a Real Property Lien that must be paid off with interest (hopefully 16%) within 3 years. If I don't get paid plus interest I foreclose on Days Inn.

Am I following this correctly? I can potential pickup a 2.2 MIL property for under 100k? I am not too clear on what happens to the mortgage if there was one. I have read that Real Property Liens jump the line over mortgage liens, and easements never go away until paid off, and the only lien that has a higher priority of Real Property is Income Tax or Federal Tax lien.

I live in Sierra Vista, AZ, so not much to pick from. Can anyone help? I am new, but I go full-bore when I think I am ready and am chomping at the bit. I refuse to be a bad statistic in investing, so I want to make informed decisions at every step.