A half-block of modest apartment buildings and strip malls on Koreatown’s southern fringe may have a date with the grim reaper.  According to plans submitted to the city in late September, a 1.6-acre site at 3076 W. Olympic Boulevard is slated for demolition, to be replaced by a low-rise residential-retail complex.  The mixed-use development, which would rise between Kingsley Drive and Ardmore Avenue, calls for a four-story structure featuring 226 residential units, ground-floor commercial space, and a two-level subterranean parking garage. The project, still in the early stages of the city’s cumbersome approval process, will require at least one zoning variance to be built in its proposed form.  3076 Olympic could be considered a southern expansion of Koreatown’s recent development wave, which has up until now consisted of low-rise apartment complexes near Wilshire Boulevard.