The article deals with the functions developing in and from private houses during the period when the physical decay of the town centre was becoming manifest. Nijmegen serves as an example because uniform sources of building inspection authorities are available. The irreversible process of decay in the twentieth century, resulting in large-scale demolition during the sixties and seventies, made research into the initial phase of the declining residential function desirable Around 1880 only 1,2% of the built-up area in the town centre of Nijmegen had no residential function (total number of houses/premises 3.161). In the period 1880-1910 there was a great increase in economic activity; the development of the residential function was laggi...