Deer Barn--Dunham Massey, Trafford, Manchester

This building is purported to be a deer barn on a former Durham Massey estate. I can't seem to find anything about it, and what strikes me as odd is that it almost looks like two two structures that have been put together at some point in time. If you split it down the middle, there a two window's on the left and three on the right. The portals over the two doors are also different which is odd. Does anybody have any more information about this historic, supposed animal building

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