Question 50 - 52 refer to following paragraph:

M: Hi, Ms. Parker? This is Joseph Sterling from Green Creek Realtors. (50) We need to talk about an issue with the apartment you wanted.

W: Oh, hi Joseph. Did you manage to find me a place in the Kahlua Apartment building?
M: Yes, that’s the reason I’m calling. But there is a bit of an issue.
W: Really? What is it?
M: (51) There is a major pest problem in the building, and they need to clear the whole building and carry out pest control. It's going to take them at least three months to make sure the building is clean. So you would have to wait three months to get a place there...
W: I see...
M: here is a building just nearby called Graceville M Towers. It's very close to the Kahlua building so you could stay there for three months then move over to the Kahlua building. (52) I will arrange all of the moving for you. Why don't you go online and check out Graceville Towers and get back to me?
W: Sure, that sounds good. Thanks Joseph.

50. What is the reason for Joseph’s call?