I tried drawing a picture in paint so you guys get the idea. That is one of the walls in the room, and there is a rectangle space at the top of the wall that is connected to the ceiling. This "wall" separates two rooms and the blue colored area is basically the "other room". I was wondering how to get this space filled in, using the cheapest method. We are leasing this place, so i do not want to do any actual construction to it, maybe just put a block of soundproof foam. Do you guys have any ideas on cheap ways to do this? I'm not sure of exact measurements, its about 5'x3'x2'.

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