This research discusses the problem of designing new buildings located within the context of heritage sites. Considering that, the privacy of these areas requires adherence to certain controls and standards to ensure the preservation of the homogeneous heritage character of the context and the protection of the unique characteristics of the place from any visual distortions that may detract from its value and advantages. As well as a review of the most important local and international charters and agreements related to world historical sites to identify the common rules and agreed principles. The research relied on the inductive approach to find out different points of view held by group of experts, critic, architectural designers and academic specialists in this field-to reach a set of appropriate design strategies for designing new buildings in that heritage area with comparative analysis of a selected group of in-between buildings recently constructed in Heliopolis.