Knowing you have a mortgage rollover every 5-years is an encouragement to pay down principal.  

Likewise, If you have any Rollover IRA accounts, you can roll them over every year, granting a 60 day float. 

(My enrollment fee is good for 1 year of service).I explained at the time that my intent was to get a card or cards with 0% introductory rates, and then roll over my CC balances to new cards when the introductory rates expired in 12 months. 

As far as putting funds into Solo 401k, there are only two ways the 401k can be funded:1) Rollover from another qualified plan2) Contributions from earned incomeFunds from the refinance can never be placed into a retirement account. 

No roll over allowed anymore.  

It might be best if you roll over to a BDRA or SDRA which allows you to transact directly through the account without any personal risk, this will safeguard your investment and you as well...

@Nicholas PrestonI'm not sure if you can rollover your 401k to a different one while keeping your job.

Roll over tenants every year and repairs will skyrocket, keep the same tenant for 12 years and your repair budget is almost nothing. 

But wait, if I had PAL-limited cost segregation losses in 2022, and I'm no longer limited by PAL in 2023, I simply roll over my 2022 losses into 2023 and use them in 2023, right?

As the plan trustee, you are the only person with signing authority on that account.When a rollover is executed it will be issued to the new plan and either delivered to you via check or wired to that account.