CREATE TABLE table_7881 ("Name" TEXT, "Location" TEXT, "Years as tallest" TEXT, "Height metres / ft" TEXT, "Floors" TEXT)

How many floors did the tallest building in Aston have?
SELECT "Floors" FROM table_7881 WHERE "Location" = 'aston'
SELECT "Floors" FROM "table_7881" WHERE "Location" = 'aston'