Is there anything in the article or the comment you replied to that implies that only empty apartments can become a health hazard, or are you just constructing

Is there anything in the article or the comment you replied to that implies that only empty apartments can become a health hazard, or are you just constructing a straw man? It seems quite plausible that landlords with a high vacancy rate could be less motivated to proactively inspect, clean, and maintain apartments that are not currently generating income and which they do not expect to generate income in the near future, as compared to apartments that are in-demand or currently occupied. So such apartments could reasonably be more in need of city inspections prompted by complaints from neighbors. And inspections of unoccupied apartments will naturally tend to be less disruptive to tenants than inspections of occupied apartments, so there's not much downside to creating a mechanism to do more inspection of unoccupied apartments.