 It also includes 15th Street, which once ran through what is now "Kahn's Alley," past 250 Frank H. Ogawa Plaza building, across Clay Street, through what is now a glass windowed lobby of the California State office building, connecting with Jefferson Street on the building's west side entrance.Motor vehicle traffic has also been excluded from where former city streets, Washington street and 13th street, were once aligned through what is now the Oakland City Center development.Today the area features an outdoor retail mall with pedestrian streets laid out to replicate the original street grid.