If your property is located in a duplex zoning, most likely you can have single family as well as duplexes (2 unit buildings).  You can confirm this by going to your cities web site and viewing the zoning code.  Once you establish your zoning district it will provide the allowed uses within that district.  If you prefer you can always call your cuties planning and zoning department for confirmation.

So do I run numbers like sfh or duplex thanks

@Demetrice Black Hi Demetrice, is your intent to buy it and turn it into a duplex to rent out if zoning allows this? In that case I would run comp. numbers to see what you could get for rent for each half. Keep in mind your costs to get it rent ready if its currently a SFH will be higher if you have to do a lot to separate the house areas.

@Justin Schreibeis I would call city planning department too like @Kenneth Garrett mentions to confirm the status.