Most cities have unsafe structure acts and nuisance building codes. I half agree with your Richard Rhyner in that as long as it is not a problem, who are "we" to say it has to come down. However, it appears the building is unsafe and it is causing nuisance issues.  Where do you draw that line? I'm not 100% sure it meets that threshold, yet. In other cities, there is a legal process to raze an unsafe structure, the owner has plenty of time to do it themselves, if they don't the city does it and attaches a lien to the property. After a long period of time the city can seize the property and either use it or sell it...