CREATE TABLE table_71603 ("Rank" FLOAT, "City" TEXT, "Roof  (  m  ) " FLOAT, "Spire  ( m ) " TEXT, "Floors" FLOAT, "Built" FLOAT)

What's the average number of floors that were built in 2004, and have a roof (m) of 106?
SELECT AVG("Floors") FROM table_71603 WHERE "Built" = '2004' AND "Roof ( m )" = '106'
SELECT AVG("Floors") FROM "table_71603" WHERE "Built" = '2004' AND "Roof ( m )" = '106'