I'm happy to personally connect with you to discuss this further if you'd like to provide a lot more context around my opinion. 

Looks like if it’s Illinois, the reason they’re probably asking is appears there’s a new law for landlord to disclose radon, provide a pamphlet, tenant has right to test and terminate lease if landlord chooses not to mitigate if high levels found.

@Nathan Frost Could you provide more insight into the portfolio.

I have not seen anyone post about this yet, so I figured I would share some of the highlights after reading the 41 Page Document this weekend  with the new CO Warranty of Habitability Law Updates.I'd like to credit my property manager, @Colin Smith, for updating me and the other owners very promptly and providing a few highlights before diving into the document. 

Has anyone found a data provider that is more up-to-date?  

The reality is the opposite - if it's not in writing then the PMC doesn't have to provide the service or can charge extra for it!

Can you please provide me with one.

This provides assurance of a stable investment.

ALL great advice and information provided above!

For more info, here is a link to the Hilltop Land Use Plan provided by the City of Columbus.