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_name_24 ( height__ft_ INTEGER, floors VARCHAR, city VARCHAR, height__m_ VARCHAR )

### Question ###
What is the smallest height (ft) of a building in Frankfurt with a height (m) of 257 and less than 55 floors?

### Accurate SQL ###

SELECT MIN(height__ft_) FROM table_name_24 WHERE city = "frankfurt" AND height__m_ = 257 AND floors < 55