[Grammar] It is 2km from here. -impersonal subject

[forinfo]

Hello,

In the following example, I've learned that the word "it" is an impersonal subject.

A: How far is the city hall?
B: It is 2km from here.

I wonder if "it" can also be regarded as a pronoun indicating the city hall.

Thank you for your reply in advance.

 

[Rover_KE]

It certainly can.

It's only an impersonal pronoun in the sense that a city hall is not a person.

 

[Tdol]

It is not an empty pronoun as used in something like it is raining because we know exactly what it refers to.