Have you factored in that your rental unit won't be full 100 percent?
Did you know that rental properties require a higher down payment and do you have enough down payment for two units? Some associations won't allow rentals while some lenders won't lend on buildings with rentals and/or for rental properties.
And have you ever been a landlord and how are you going to find tenants?
Speak with a Realtor who has experience working with investors, they will lay out your options in a more simple and complete way than you can get on Trulia. I've been investing and have been working with investors since 2002. I'm happy to explain in greater detail.
Lynn911 Dallas Realtor & Consultant, Loan Officer, Credit Repair Advisor
The Michael Group - Dallas Business Journal Top Ranked Realtors
Have you considered getting a duplex instead?