After a brief lull to start the year, construction is once again moving forward on the Sares-Regis Group's Little Tokyo Apartments.  A red construction crane has been raised high above the intersection of 2nd and San Pedro Streets, while a caravan of cement trucks helps to lay the foundation for the future $100 million development.  Set to rise seven stories, the TCA Architects-designed project will create 240 apartment homes above 16,000 square feet of ground floor retail and restaurant space.  Residential amenities will include a swimming pool, spa, fitness center, rooftop deck and a three-level underground parking garage.  Sares-Regis' project joins a similar 280-unit development from Avalon Bay, currently wrapping up construction next door.  The two projects represent the final build out of Little Tokyo's Block 8 redevelopment, which has successfully transformed what was once a six-acre parking lot into a trio of mixed-use complexes.  Both developments are also slated to gain a mid-rise neighbor in the near future, as the Malibu-based Weintraub Real Estate Group has plans for nine-story apartment building adjacent to the Cathedral of St. Vibiana.  Slowly but surely, the dividing line between Little Tokyo and the Historic Core is starting to blur.