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_75395 ( "Years tallest" text, "Name" text, "Height ft / m" text, "Floors" real, "Year completed" real )

### Question ###
What year was the building completed that has 10 floors?

### Accurate SQL ###

SELECT AVG("Year completed") FROM table_75395 WHERE "Floors" = '10'