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_94 ( us_cham_rank INTEGER, next_highest_spender VARCHAR, year VARCHAR )

### Question ###
Which US Cham Rank is the lowest one that has a Next Highest Spender of national assn of realtors, and a Year smaller than 2012?

### Accurate SQL ###

SELECT MIN(us_cham_rank) FROM table_name_94 WHERE next_highest_spender = "national assn of realtors" AND year < 2012