"Value" is irrelevant.  Unless you are asking about it for possible stepped up basis due to death of the husband?

I'm not clear on the time line of the 'unreported rental', the DOD of husband, and the creation of the LLC.

And what state?  That may/will have bearing on the return needed (or not needed) for the LLC.

And how was title held on the rental property?  That may/will have bearing on the possible stepped up basis question.

Lots of info needed to even start trying to address this 'simple' return.