How much potential does real estate really have?

[Thomas Weber]

Hey BP Forums,

First timer here and was just wondering how much potential does real estate really have? More specifically, I'm wondering how long it would take to get your passive income to be roughly $100,000 a year if you start out with $50,000 for multi-family homes in the mid-west. I'd plan on investing a base of $50,000 every year plus the additional income that the properties would generate yearly. 

Also, anybody have any tips to be as efficient and quick as possible when building your portfolio?

Thanks,

Thomas