That's a good question. I will answer and perhaps Mr. Hounzangbé will have something to add.
Although the two apartments are in the same building, their layout and overall condition are different. The one currently occupied by Canada's representative to the United Nations is on two storeys. It is completely different from the other apartment. Moreover, it was renovated in 2010–2011, so it is not in the same condition as apartment 12E, where Mr. Clark lives.