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_53640 ( "City" text, "1970" real, "1980" real, "1990" real, "2000" real, "2010 est." real )

### Question ###
Which is the lowest 1980 growth that had 2,610 in 1970?

### Accurate SQL ###

SELECT MIN("1980") FROM table_53640 WHERE "1970" = '2,610'