I have a fishtank upstairs I need to syphon/empty water out of and cant carry downstairs....best way to do it?

Hey! I'm moving and I have a 35/40 gal fishtank upstairs in my apt. And it is WAY too heavy to move downstairs. How would you suggest I most efficiently drain the water out? I was thinking of syphoning it out the window, but its a long way down so I dont even know how that would work? HELP! Thank You in Advance! :O)