ADA Questions-Staircases for external access-TN

[Cody Taylor Coppola]

I'm looking at purchasing a rental property near Chattanooga, TN at the moment and there is a tract of land about 10 feet above and behind the unit. There's more than enough room to build a new free standing 2/1 rental but it will only be accessible via a staircase from the initial driveway. Am I open to any ADA liability if there isn't ramp access to the rental? The staircase is already existing and just needs a refresh. It seems like most of the information on laws I can find is in reference to the physical house itself. 

Thanks in advance.