You would contribute the property to LLC. 

If I partner up with someone and they use one of their conventional slots to buy a property (we both contribute funds for down payment) can I be added to the title? 

By the way, I love the Bigger Pockets community, and I look forward to contributing more in the near future.  

Bogus.The Tax Court correctly ruled that transactions were bogus, that it constituted excess contributions to the Roth, and imposed a tax of about $40,000.The Court’s reasoning is very important to REI.

(Yes, due on sale clause risk, but I've lived with that myself for years without any issues.)3) The equity from the property should be the contribution from the first couple and the second couple should contribute cash such that each party has equal contributions to the LLC.I would definitely have a real estate attorney help you with this as it is too complex for an on-line LLC creator.

Thank you for your contribution to your thread.

With the truly self-directed Solo 401k plan custodian is not required, you can have ability to make post-tax Roth contributions, borrow up to  $50K via participant loan and more!

That being said, any family/friend/associate willing to capitalize on your hard-work and dedication contributions with them bringing funds to the table?

You can't set it up just for purposes of qualifying for a Solo 401(k).Also, if you contribute to your day job's 401(k), you can still contribute to your Solo 401(k), but the total contribution limit ($18,500 for 2018) is the max for both plans combined, not separately, meaning that it's not $18,500 for your day job's 401(k) and $18,500 for your Solo 401(k) but rather a grand total of $18,500 for both.

Contributions into new entities after completion of a 1031 is a fairly common practice in the world of partnerships and mergers.