I was once assigned a building which was literally in tatters, but the owner still wanted it to be operational for his workers. After much convincing through reports and physical inspections, I was able to persuade him that the building was uninhabitable until a thorough renovation could be performed on it. I believe that this was the biggest challenge that I have come across, because if I hadn’t been able to convince him, it meant harming the people who would eventually work there.