The original author of the object does not have to be the only person who cares about the object, as shown here you seem to have interest in maintaining these objects for whatever reason.  My sole concern here is that they are both causing validation errors due to improper tagging (derelict versus razed? layers?) and clearly demonstrating a conflict between objects that are currently there - and as many of us have decided, the best course of action is deletion.
As my main interest is streets, this is really of no concern to me, but I will have to put in my two cents that I fullheartedly agree with all who have deleted these objects.