Under contract with home with a unpermitted bath.

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Here's the scoop: Current owners have been there for decades. 

House is listed w/ 2 baths. 

While under contract OPRA request comes back and doesn't show permits for 1 bath.

Owners claim it was purchased with the bath. 

Since it was so long ago, I cannot find original purchase information. 

Called Assessor asking a "general question" about rooms, and was told the home is listed as 1 bath.

Is it reasonable to ask for a permit for this bath? 

When is something like this considered grandfathered in?  

What penalties or issues do I face if we proceed?

How is Union township building dept in dealing with this type of problem? 

Thanks!