Don't know if you hold notes, Trustees will generally accept them, there can be accounting issues as the Trust accounting requires valuations annually, some may want a "market value" rather than the UPB, that means appraising and I was the only guy who appraised notes in the mid-west and I'm retired, so they may sell and roll over accounts to easily managed assets.....securities.

@Rob Kulp Most leases roll over to month to month unless the lease specifies other wise. 

So, you'd get the purchase price back, put in 50-60k in rehab , all on a loan that allows you to roll over into a normal mortgage.

@Justin Windham I read that you can roll over an existing 401(k) from your W2 job.

ps- im an avid pet lover but do not condone captive household housing of any non-domesticated species nor any activity -including now medical/wellness exploitation - that keeps the dog/cat euthanasia levels as high as they still are despite all the free spay/neuter programs going on for decades nationwide - sighhh- lest Bob Barker not roll over in his grave; i mean rest his soul in peace!

There's no proceeds to roll over.

The animal must be singularly identities and be identifiable.My point is one doesn’t have to just roll over and play dead if someone hands you this stunt while occupying your property.

So if you have to cash out or rollover, you could rollover to a SDIRA and use your retirement funds to purchase real estate. 

If my wife and I start investing in real estate and we set up a solo 401k to access our IRA funds can we both rollover our traditional IRA's into the solo 401k trust account, in effect consolidating our funds to access them for real estate investing, or would the IRS prohibit us from combining our funds in this way?

In order to do so you need to set up self-directed Roth IRA, rollover your existing Roth into it then new SD Roth IRA will buy the rental.