Graham Hill, the founder of green design and living site TreeHugger, transformed his Manhattan studio apartment into an uber-efficient living space four years ago. He’s now ready to move on and has put the pad up for sale for a tick under a million bucks.

As you can see in the video above, the apartment uses virtually every space-saving technique you can think of – and then some. Prior to building, Hill set up a crowdsourced contest to attract architects to the project and ultimately went with a $365,000 design from Romanian architecture students Catalin Sandu and Adrian Iancu.

Paying that kind of money for 420-square-feet of living space is ludicrous by most people’s standards but the amount of time and creativity put into the project is no doubt impressive.

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