Instead you can do the following :1) Invest passively with existing Syndication and/or 2) Be a syndicator and find a Sponsor for Loan docs. 

@John D.Rental income does not qualify to sponsor a Solo 401(k) plan. 

The loan sponsors are Mark and Abraham Mermelstein, Yehuda Ruzohorsky, Boruch Fink, Joseph Friedman and Aaron Lazar, a consortium of investors who appear to have done deals together in the past.Two loans list Hannan Lis and Gideon Pfeffer as loan sponsors secured against the Retreat at Farmington Hills inthe outskirts of Detroit and the Verona at the Park development in Washington.

Additionally, this structure eliminates the need for active management, as the real estate assets within the DST are managed by the sponsoring entity.As an investor your level of activity would include collecting monthly distributions, receive quarterly reports on investment, file taxes annually and exchange DST year 7-10 years (sometimes shorter depending on the market).

Hey Dan, It could be a huge red flag if the DST Sponsor is not providing their track record.

If short sale sale due to reverse mortgage or foreclosure then the borrower/principal homeowner per HUD [the foolish sponsor of the conniving manipulative reverse mortgage industry that is out to take homes from remaining Baby Boomer seniors & elders so younger families can purchase the homes instead while those seniors and elders are placed into senior living centers etc.

Think / how do I make moneyThey also list a bio of the sponsor key people.

If you click on the build your team tab you will see the directory of sponsored advisors and if you check out the personal finance section you will see several of us that post regularly.  

It cost us around $3k per fund (we had all five funds evaluated) Cheap money and easy way for sponsors to put their proverbial money where their mouth is.  

--------------The rules regarding 401(k) loans can vary depending on the specific plan, but here are some general guidelines that may apply to your situation:Employment Status: Typically, 401(k) loans are available to active employees who participate in an employer-sponsored retirement plan.