In the past era, the aspects of integrating the new building with the existing one appeared to be concerning the outer appearance or features of the tradition urban context. After the call of for sustainable development, the aspect of designing the building varies to suit the sustainability. So, Smart sustainable preservation is about evolving our existing building stock, instead of razing and building new. At the same time, the intelegancy of the materials and the aspect of the intelligent building seems to accomplish the need of sustainability ,as intelligence actually is a mental and sensitive deal with the matter which promotes motion and actions to solve much issues concerning it, but within these aspects their aren't a clear criterion to deal with old spaces in a smart manner without losing its style and taste .On the other hand, there aren't a fully respect for the future response of the urban design of such old sites which could be treated in such a smart manner. So the liability issue is : 1^st  concerns the search for the main conventional applications that could be followed to support the presence of new buildings placed in these places but defiantly in a smart manner supposing that using techniques and tools being developed today to make complete high performance products is one of the main hypothesis that could be followed and the 2nd one is the multi functioning of any element of the space .The followed methodology is measurable where measuring the main approaches applied in the smart or the intelligent aspects to deduce the main aspects that must be used to inform the integration between the new building and the tradition urban context.