@Evan LoaderTexas does not have a separate individual income tax filing.Kentucky and Georgia may have a tax filing requirement based on a minimum net income/gross income threshold.Even if you are not required to file, you may want to consider filing - to roll over potential NOL's.Furthermore, a filing doesn't necessarily mean you have to pay a tax - i depends on what the income from the K-1 reports.

You can also set up a self-directed Traditional IRA and fund it with a rollover from your 401k (if eligible for rollover). 

I thought I was so very smart by setting up all my rentals to roll over in the summer when they are the easiest to rent. 

@Erik HatchYes, you can rollover Traditional IRA into 401K.

And since some savings usually roll over year after year they are a great deal.

otherwise, can I roll over my negative K1 in 2019 to 2020 and turn my ordinary income to be passive income then offset them?

Do I understand correctly that I can roll over the IRA and non-IRA stocks into a Solo 401k, not the Roth IRA, then use the $ value of these investments to fund R.E. investments, such as down payment for a mortgage, or purchase outright?

First you would establish an IRA with a custodian that allows for alternative assets and complete a rollover form.

All these things are connected and the booming housing market looks ripe for a 2009 roll over to happen once again. 

The 401k can accept rollovers from any other qualified retirement plan except the Roth IRA (for now, there is proposed legislation so that this restriction may be removed in the future).