Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE Apartment_Buildings ( building_id VARCHAR, building_short_name VARCHAR )
TABLE: CREATE TABLE Apartments ( room_count INTEGER, building_id VARCHAR )

### Question ###
Show the total number of rooms of the apartments in the building with short name 'Columbus Square'.

### Accurate SQL ###

SELECT SUM(T2.room_count) FROM Apartment_Buildings AS T1 JOIN Apartments AS T2 ON T1.building_id = T2.building_id WHERE T1.building_short_name = "Columbus Square"