Should I convert a single family home to a duplex?

[Jesse Eberle]

Hello, this is my first time posting, as I'm new to this site.  I've recently closed on a 3/2 house that has had the garage converted to bedrooms (making it a 5 bedroom).  The layout of the house would work well as a duplex.  Market rent on the house is appx.  $1800 as a 5 bedroom.  If I convert it, the 3/1 would rent for around $1500.  The 2/1 smaller unit would rent for around $900.  

There would be some conversion costs, but not cost prohibitive.  What should I know about ?  Am I missing anything?  Thanks.