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_64743 ( "Rank" real, "Name" text, "Height ft ( m )" text, "Floors" real, "Year" real )

### Question ###
What is the lowest rank for El Paso Natural Gas Company Building?

### Accurate SQL ###

SELECT MIN("Rank") FROM table_64743 WHERE "Name" = 'el paso natural gas company building'