You should consult an attorney about your legal obligations. The obligation to disclose latent defects where you live, and even whether this would be considered one, is something you need to discuss with an experienced lawyer. You want to make sure you understand this thoroughly before proceeding.

Ethically, well.

The only thing that gives me pause is that you mention not ‘seeing’ any since treatment (and how long ago was that?). As you know, bed bugs may be present below detectable levels, for various reasons. You may not see live bed bugs, although there will be other signs if they’re present. And yet observation of the signs may be challenging even for professionals. Further, bed bug infestations are capable of receding and then reappearing. Whether some bed bugs hide out only to return or whether small, still active, numbers are not detectable I don’t know, but it happens.

I would suggest that you take every possible step to confirm that the infestation is indeed eradicated, especially if anyone in your home is not or has not previously been allergic to the bites. Such steps might include thorough inspections by professionals or bed bug dogs and the use of an active monitoring device.

We should talk about it more. I definitely have thoughts to share. Good luck.