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To invest in real estate, you will have to have your IRA with a custodian that allows you to have a self directed IRA. Many custodians do not allow this.
Also, your IRA should be liquid enough to pay for the property AND all the other bills that come along with it.
For example, come tax time if you don't have the funds for property taxes, you can't just write a check and deposit it into your IRA...you still have to adhere to the limits set by the IRS
If there's a major repair, such as a roof or HVAC system, that too must be paid out of the IRA
You cannot self deal, meaning you cannot have an ownership interest in the property nor can you rent from yourself.
Here's a good article on the topic: CLICK HERE
I understand there are custodians in Nevada that can assist a person in this venture.
Yes, you would just have to locate one of those custodians and do a rollover
Can you have borrow from your IRA to make a purchase as a loan, and return principle and interest to the IRA?
No, you cannot do that -- loans are not allowed from IRAs
Can the IRA invest with other peoples' IRAs to make a purchase, or should this be done via limited partnerships?
You could have an LLC, and have the IRA a part owner of the LLC
And other IRAs could be other members of the LLC
Can you recommend a good book on this topic, and a good website?
Here's a book CLICK HERE