You would have depreciation recapture on the items you depreciated (75k), taxed at ordinary income rates and then any of the actual property appreciation would be taxed at favorable capital gains rates (50k). 1031 exchange will allow you to defer all of that gain as long as you meet conditions.

Major items include clearing overgrown shrubbery, replacing doors, fixing up the deck, getting a pond running again, and removing an in-ground hot tub.

A few additional items to help you: 1) If you have a Roth IRA, a Roth IRA can't be rolled into the Solo 401(k), only pre-tax funds.

And that’s with issues and that pop up, however it’s brand new so probably won’t have too many items to fix in short term.Sounds like I should list it. 

It also included storing the items. 

You could also reach out to a local, reputable, property management firm to see if they offer a la carte services for lease preparation, application processing, move in inspection, etc, if you are planning to self-manage but need some help with the more formal items.

What action items were you helped with? 

You can always ask for those items at any time, but it doesn't mean that you'll get them. 

Due to item 1, adding an ADU can require years to start achieving any return (once the accumulated cash flow recovers the initial negative position).4) Adding an ADU is a slow process.

I have remodeled the unit completely prior to putting it to rent, including addressing pre-movein readiness checklist I was given by RL after they walked through the unit (small list of punch items like toilet paper holder, cleaning unit, door stopper etc.).