If you realistically could work ~80 hour weeks, or do 2 jobs simultaneously, you can theoretically fulfill the requirements for the Solo401K.J.D. 

I have worked with agents in the past who I used only for the showings and offers and it wasn't as fulfilling an experience for me. 

I'd recommend trying the renovation yourself, you'll learn a ton, hopefully get fulfillment, save a ton of money and only lose a little sanity.

Are you getting quality tenants that pay on time, fulfill their lease term, and leave the property in good repair?

Those terms were not fulfilled when the HVAC system was no longer in working condition.

Thereby sidestepping the requirements to bring it up to current code while fulfilling the original problem which is the sound isolation from the adjoining unit. 

Goodluck man, I hope we all find fulfillment in RE

As long as he is making the payments on time and fulfilling all the other land contract obligations, he's the stuckee. 

Smarter minds than mind have done the research and calculate they will fulfill a need and make a profit at $1400-$2900 monthlyI have 3 condos in BroCo and try to console myself that my condos, which rent in the $800 $1000 mark, are not competing with that other demographic...that my tenants benefit from having these other renters become part of BroCo.

I work with long-distance turnkeys and you can very easily use a 1031 to buy multiple properties that will fulfill the requirements of the exchange.