Where are the two speakers?

M: It is so crowded here. Is it the downtown of the city?
W: That’ s right. There are a great many buildings, restaurants, and shopping malls here.
M: What’ s that building on the corner, right next to the city hall? It looks like an oyster. I like the unique shape.
W: Oh, that’ s a famous theater. You can enjoy concerts and operas there. It has held many famous performances on some special occasions.
M: Sounds great. Well, where can I buy everything within a building? I don’t like walking around.
W: What do you want to buy?
M: Postcards.
W: Then you should go to the Century Avenue. There is a big post office selling all kinds of postcards. I’ 11 go there as soon as I’ ve picked a present for my friend.