Washington, DC, is one of the most stunning and vital cities globally. It is not just because of historical sites, monuments, and political power, but it is a home for a diverse population and an increasingly diverse economy. Almost twenty years ago, the city planning department envisioned the plan of "Living Downtown," which is now significantly applied as a "mixed-use development" in the central Washington district. Looking back to downtown DC's history, central Washington is changing enormously from commercial to residential and Mixed-used sectors. Now it is essential to consider the reflection of those changes on the city's urban fabric and street life.