You can attach the run to your window to expand the activity space. Platform on the Left and Right (each): 30.52"L x 9.84"W x 0.71"T(thick). Platform in the Middle: 20.87"L x 9.92"W x 0.71"T(thick). Cat Condo(each): 15.08"L x 9.37"W x 9.84"H.
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