Abandoned Foundation on property - can I transfer septic rights?

[Kathy Moser]

Hi Real Estate Mavens,

Thanks to all the education and inspiration I found here I am planning to make an offer on the property where I am renting.  

The owner owns 3 houses and also a small lot that used to have a house on it and still has a foundation.  Likely it has a cesspool.  I'm wondering if I purchase all the lots if I may be able to transfer the "rights" for the cesspool either to one of the existing houses to add bedrooms or to a new build tiny house.  

How can I query this without tipping off the owner that I'm thinking of increasing the value post purchase?

I'm on good terms with the township administrator but not sure if that's where I should start.

Anyone have any experience with this issue?  Thanks