With the rapid expansion of Downtown LA's residential population, a variety of eateries and retail establishments have set up shop in the neighborhood.  Another (albeit less exciting) necessity for a growing community is improved medical services, an area which now must play catch up due to Downtown's growth spurt.  With that in mind, Good Samaritan Hospital's $80 million expansion finally got concrete in the ground this past August.  The steel skeleton of the Medical Plaza and Outpatient Pavilion currently stands two floors above the northeast corner of Wilshire Boulevard and Witmer Street.  When completed, the seven-story, 193,000 square foot edifice will house the hospital's radiology and oncology departments, in addition to an ambulatory surgery center.  The Ware Malcomb designed facility will feature a two-story lobby on Witmer Street, shared with one of the hospital's existing buildings.  Good Sam' also intends to foster new pedestrian activity in the Westlake neighborhood through the inclusion of a ground floor cafe and a window display focused on medical history.  The Medical Plaza will soon be joined by a slew of mixed-use neighbors, including the Valencia by Sonny Astani and a proposed 52-unit development across the street.