@Lionel Mosby JrThis has been discussed several times before somewhat recently, but I can't find the threads right now..First, most I believe use LLC's for the limited liability. 

You start with a small limit (sometimes as little as $300) and provide a deposit, but as you use it and pay it back, they will report to the credit bureaus to help boost your score. 

We will work together to overcome limiting mind sets, create long & short term goals and actionsteps to achieve them, create a vivid vision of what we want our lives to look like and become, we will be able to encourage and hold one another accountable as we embark on our new business ventures.

But since there is a limit to how much money the bank has access to....their rate will be higher...and usually a shorter term.

Some cities have legal limits to the percentage you can increase rent annually.

But they are limited it to people who have 3 or less properties. 

He would do a limited one.

With Fidelity 401k plan you will be limited only to Fidelity investment offerings, to invest in real estate and other alternative investments you need truly self-directed Solo 401k plan.

How often do they have special assessment, do they have good reserves, will they change the rules to limit or ban rentals?  

If you are self-employed or own a small business - you will be eligible for a truly self-directed Solo 401k plan, which is exempt from UBIT on leveraged real estate, has contribution limit nearly 10X higher compared to an IRA and number of other benefits.