ADA Requirement on a smaller office building?

[Will Gaston]

All:

I have a potential tenant who is looking to sign a 3 year lease for my first commercial property , a ~2500 SF office building that is over 100 years old. I've done ~50k in renovations and it's in great shape. But it's still a hundred year old  building. It doesn't have a ramp, handicap accessible bathrooms, or other new commercial building requirements that are typical.

The lease that I've offered them says that they are responsible with complying with any ADA requirements, but they want me to be responsible. I own ~50 residential units and have very little commercial experience so I have no idea what that might be.

Is there a minimum building square footage that requires ADA upfits? Is there anything that I should be aware of? I do not want to get a phone call a month after they move in saying that they have to have 20k worth of ADA compliance work.

FWIW the tenant and their lease offer seems to be a solid one. They have 5 offices in 5 different states in the Southeast and do archaeological services. The building they would be renting from me would be mostly office work, not a lot of outside traffic that I'm aware of.