Especially if higher returns can be made without much additional effort. 

What additional information do I need to consider in determining if I should sell or hold? 

The Downside on the Duplex is there isn't much value add. It's

Additionally, the property has to be in the same school district as the school you work in

Thanks for the responses @Jeff Kehl @Michael Flight @Joel Owens and @Ronald RohdeAppreciate the additional thoughts/factors to look at regarding VPD numbers Joel.Assuming there isn't someone on the message board who could give me a quick tutorial/instructions on how to find the numbers myself on TXDOT's website, I'll try giving them a call.

I'd say that's a bit on the high end, so I'd get additional quotes.

In this case, would it be wise to get an additional loan to cover the remainder of the property or wait until I am able to save up enough money on my own? 

If additional info is needed please ask.

I am adding an additional room.  

And with the $50,000 from those two houses I'd buy a third house and get $25,000 down with an additional $500 a month cash flow and keep doing those until I ran out of cash.