@Mark SenecalIt probably does not make sense to start a new Roth IRA for the purposes of combining with a Traditional IRA.Say you have $100K in Traditional Funds and you contribute $6500 (the max if you are over age 50) to a new Roth.You could setup two IRA plans and use them to jointly purchase a property, but you would be locked into the equity ratio of the initial purchase, which would be something like 93% Trad to 7% Roth (depending on purchase price, and the need to keep reserves in both accounts).  

You do not need it but it may be best to use people who are familiar with the house.Check bank account make sure all the money is there especially if you have a joint account or anyone else has access to your account.Do you have insurance in place?

Since each investor may have different borrowing ability, the loan clause "joint and severally" means that the strongest investor will always bear the biggest burden.

In forming a new entity/venture, it is OK for the IRA and a disqualified party to have up to 100% combined equity.Such joint venture transactions are often promoted loosely on the internet, including here on BP.  

I also tend to think most JV's are not proper joint ventures and are more like two folks, albeit entities or people, trying to work on something with a very loose document tying them together.  

Looking to do a bunch over the next few months and want some input on best way to protect ourselves and those who partner with us.Should we set up new LLC's, partnership agreements, separate accounts or joint account for property, etc???

@Ted Meltzer @Robin Pritts @Michelle Williams @Dhru Das @Albert W.We emphasized our group using no money down techniques to get funding, as our members utilize these strategies we joint venture with new members and get into projects.  

Has anyone created a lease that made all parties jointly responsible, but allowed one to stay for, say, 6 months, and after the 6 months, the tenants staying for 12 months become the only responsible parties? 

Are they jointly and severally responsible for the lease? 

Thanks @Wesley Williams for the intro@Jonathan Smith there's a lot you can do with just a little marketing.You could call the basement an "office" or a "den" and that's something you could market for higher rent.Also, I've written in detail about an "Inn Keeper" profit center where the landlord joint ventures with the tenant to host Airbnb/VRBO guests.