We can find various types of extensions of private commodities such as plant-boxes, bicycles and other household goods in alley-space which tenement style houses are faced. We sometimes assert that the closed type public space facilitates private use more than the open type. But, the results of five surveys on the private commodities in 53 alley-spaces reject this hypothesis. These suggest that habitants in the open type alley-space use public space privately for making their tight community space and their behavior do not block the passage in public alley-space.