@Eric E.I would agree with what @Dmitriy Fomichenko has said.It is possible to create a joint venture or other type of equity sharing arrangement, but it gets more complex to do so.If her IRA is a lender, she has a simple transaction with the mortgage as a secure instrument.

I would also consider joint ventures to get started as well.

2)  If we purchase an investment property through this Solo 401K and we want to own it jointly, do we fund it from each of the two checking accounts?

Kyle Scholnick give the guy a break he's here to find out if what he is doing is a best practice in REI...but let's look at what is best practice...oh wait it's called learning from your mistakes...I have 10 SFH/12 mortgages that I collect payments on and a 351 apartment complex with 351 personalities that u must deal with...my biggest advice I give people is once u have made a mistake analyze it and figure out what wen wrong and make it your goal to never make it a 2nd mistake...in this situation if this tenant is willing to leave than let him leave...but the end of the year is coming and trying to find a new one might be difficult...so I might do is go over his finances with him (not weird because his rent is the only thing that matters above any other bill) and figure out what he can afford (pending on the landlord situation) and create a contract for a specific period up to spring time and find a tenant that is willing to pay your rate...just my humble opinion

@Evan Smeenge  I guess I can see your point because you don't see the bigger picture, look at long term as long as your cash flowing, your doing well $500 / mo doesn't sound like much but let's say you end u buying 10 more tri-plexes in next 10 years make 5k monthly isn't that better?

Dan from Stamford I would like to hear more when u get the time.

Stephen, the ones you have under contract, do u simultaneous close on them when you get buyers for them?

Is it too many for u to handle?

Do you know where I can find out what goes into a typical multi family joint ventures agreement?

I've had folks referred to me by agents, who then turned around and fired said agent, but stuck with me, because the agent thought it was a good idea to put things like "how r u on teh house hunt?"