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 table_38557 ( "Name" text, "Street address" text, "Years as tallest" text, "Height feet / m" text, "Floors" real )

### Question ###
What's the least amount of floors at 921 sw sixth avenue?

### Accurate SQL ###

SELECT MIN("Floors") FROM table_38557 WHERE "Street address" = '921 sw sixth avenue'