Building additional unit in existing rental property

[Agustin Farias]

Hello BP community. We are from San Antonio TX and recently bought our first rental property, a duplex (both units rented) and the property has some land where we would like to build a 1/1 unit. We are brand new in the REI game so we have no idea where to start doing research to see if it is even possible to build on this property. We've done some research in the city's website but it's a little tricky to navigate and understand the lingo. Any advice on where to begin? Thanks for your comments!