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Of course the mass will remain the same. The force it exerts changes inversely with the square of the distance from the center of the earth's mass, but the difference between 40 stories up and ground level is negligable.
Even if you were 1km higher, since the radius of the earth is a bit more than 6000km, the difference in gravitational force would be less than 1/6001^2 - 1/6000^2 or less than .008%. Remember this example has you a kilometer up, and the trash would weigh .0047 ounces less.
So technically, the trash was heavier at ground level.
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