I'm determined to at least have my first physical property before 2018, but it's extremely frustrating when you feel like you're doing the right things and yet...nothing.

So it's the same thing you're trying with the 4-plexes just 2 physical structures instead of 8.

Hello Liwen,In addition to custodial self-directed IRA and Checkbook IRA you may qualify for a truly self-directed Solo 401k plan, which does not require a custodian and you don't need an LLC to have the checkbook control.

I just graduated from college with a degree in Engineering Physics.

We do not want to physically collect rent, especially cash which we would not desire the tenant to send through the mail. 

Don't forget about occupancy inspections, that's $100 per unit pretty much every year you have a turnover.Like Austin also mentioned, what is physical vs. economic occupancy? 

That means engaging with an attorney to do their part in court, and with the sheriff to do their part physically removing the tenant.

Now that I feel I have decent knowledge base I am excited to start meeting other investors and developing relationships to help take me to the next level.I am 31 years old, married with 2 small kids, and work as a Physical Therapist overseeing a clinic in the west suburbs of Chicago. 

My background was actually in physics, which I taught for several years so I understand the importance on making data driven instructions.

Here are some reasons why: Compared to an IRA, Solo 401k contributions limits are roughly ten times higher.There is no custodial requirement for the 401k.You don't need the additional expense and administration of an LLC to have checkbook control.There is a built in-Roth component whereas IRAs are either traditional or Roth, not both.A spouse can also participate in the same Solo 401k plan.The Solo 401k has additional tax benefits over an IRA when investing into real estate using leverage.The penalties for prohibited transactions are less severe, though it's best not to utilize this benefit :)