However, this is highly audited area and you will see some blocks:1) you need to find a right asset first that you  enough depreciation with cost seg. 2) you need to materially participate in that activity.3) your losses might even be limited based other IRS code section. 4) You need to have an audit proof and documentation of real estate professional status.If we are talking about a huge tax bill, I’m pretty sure you would benefit from hiring a good CPA who can cut your tax bill.

Decided to buy some of these limestone blocks. 

You could try sending a letter to owner of record to the billing address on the tax bill.  

He then robbed a business a block away manned by a single woman.How do you get started on this?

At closing, send a New Owner Introduction Letter and let them know that at the expiration of their current leases, a new lease will need to be signed and the rent will increase to $x. 

I confirmed the notice in a letter back to him.He’s very manic, telling me people are breaking in the house, but not stealing anything.I’ll file if he doesn’t vacate at the end of the month, but curious if someone who’s been through this has other ideas.

For safety reasons, some agents won't show homes without a pre-approval letter or proof of funds, so it's best to get pre-approved as soon as possible.

The county could have easily found me by simply visiting the secretary of state, looking up the LLC registered agent, and then contacting me accordingly (sending certified letter or personally serving me). 

But currently the only proof will be pay slips and appointment letters etc, apart from 2020 returns filed in the US. 

I know an agent who does this (more in Orange County though) and she will send out letters to homeowners in areas that I’m interested in buying to find off market deals.