Question: What is the main use for the structure listed in Walker City, Iowa?
SQL: SELECT "Main use" FROM "2-166570-2" WHERE "Town" = 'Walker City, Iowa';

Question: What year was the structure in Greensboro, North Carolina considered tallest?
SQL: SELECT "Year" FROM "2-166570-2" WHERE "Town" = 'Greensboro, North Carolina';

Question: What was the earliest year that a structure was located in Gray Court, South Carolina?
SQL: SELECT MIN("Year") FROM "2-166570-2" WHERE "Town" = 'Gray Court, South Carolina';

Question: What is the main use of the structure that was in Redfield, Arkansas before 2004?
SQL: SELECT "Main use" FROM "2-166570-2" WHERE "Year" < 2004.0 AND "Town" = 'Redfield, Arkansas';