CREATE TABLE table_79915 ("Name" TEXT, "Street address" TEXT, "Years as tallest" TEXT, "Height feet / m" TEXT, "Floors" FLOAT)

How many floors does the Blue Diamond have?
SELECT SUM("Floors") FROM table_79915 WHERE "Name" = 'blue diamond'
SELECT SUM("Floors") FROM "table_79915" WHERE "Name" = 'blue diamond'