Translation:The house's foundation is not excellent.
Sorry for the split post. In this case we are not talking "famous" but "excellent" (fremragende). First, one would never speak of any construction as not perfect as there is always some defect in it, so it is always not perfect. Second, one would only speak of the foundation separate from the house if there is a specific problem with the foundation. But if there is a clear problem, it is the problem that would be stated. One would not say that the foundation is not perfect to identify a problem. One could say that the foundation is defective or has a problem, but not that it is not perfect.