That doesn't make sense as it wouldn't be over the threshold to tax at 20 percent.

I want learn if there are any tricks like lower taxation, or incentives in some states.

According to the Ohio Department of Taxation, "every nonresident [of Ohio] having Ohio-sourced income must also file."

@Derek BennetsenTo clarify, a Solo 401k is specifically exempted from taxation on Unrelated Debt Financed Income (UDFI) when the plan acquires real property using a mortgage.  

None of the common softwares out there do this automatically.A C-Corp can be a good structure, but it does come with a lot of other headaches as well as the double taxation issue, so make sure this is really the best scenario for you before you head down that road.  

I don't know how much debt you have in the place currently or what your basis is, but a 1031 offers a good deal of flexibility for you regardless and would allow you to move into a more diversified portfolio, potentially even using your other cash to expand the exchange further, and defer taxation on a pricey piece of RE.

With any entity consideration, it's always good to consider things from 1) Insurance, 2) Taxation, 3) Legal, 4) Financing perspectives - would be fun to get your attorney, insurance agent, banker/mortgage broker and accountant together in a room and get the lowdown on S-corps, LLC's, trusts etc, to see how they consider each of these from their viewpoints!

This gave me the ability to contribute up to $5,500 pre-tax at my own discretion to limit my tax liability come tax season. 

If you are using the LLC to provide a product or service and generate earned income, then that LLC could sponsor a Solo 401(K) plan.Generally speaking, if you qualify for a Solo 401k - both today and for the long term, there are some advantages to the Solo 401(k) format in terms of higher contribution limits, elimination of UDFI taxation on leveraged real estate investment and a few other factors.  

You need to be careful not to be providing services or adding value to the IRA personally.Such transactions will have exposure to UBIT taxation, since they are considered a trade or business and not passive investments.