"What's the story with this apartment building off Wilshire?" asks a reader, sending in the above pic. "And is it trying to communicate with aliens?" We're told the building is located a few blocks south of Alvarado, close to the MacArthur Park. Any of our fine readers reside in this mysterious cube? UPDATE: A reader has some fascinating news about the inside: "It's the American Cement Building. The X-cross external support frame is entirely made of concrete, so no internal supports are needed. Amazing views inside. Now I believe they lease it as lofts."