Many heritage buildings express and embody the values and culture of the society in a particular period. It is also characterized by steadfastness and continuity, as it is an existing material fact that imposed its acceptance on society. Recently, many attempts to preserve the heritage have appeared. Rehabilitation is one of the most important policies adopted by the state to preserve heritage buildings, as it works to protect and sustain the building in a practical way and integrate it with society instead of being a closed landmark. The problem of the study is the failure of some rehabilitation projects of heritage buildings, especially in choosing the suitable use, which leads to a loss of identity and value despite the efforts made, but it needs conscious and systematic organizing processes to lay scientific and organized foundations to deal with archaeological buildings. The rehabilitation of Wakala Al-Ghouri is one of the most important projects implemented in the Al-Darb Al-Ahmar area. The aim of the research is to study and analyze the project from the financial and functional sides, based on evaluation questionnaires from criteria extracted from the foundations and requirements of the rehabilitation policy. The study concluded that the physical rehabilitation achieved its goal, while the project was unable to choose the suitable function of the building, and a proposal was submitted for the new use (heritage hotel) according to the results of the surveys.