In the Tenderloin on Saturday night, three men were heatedly arguing in an apartment building over on the 400 block of Jones Street (at Ellis). During the fight, one man died after he suspiciously fell down an elevator shaft, landing on an elevator car several floor sbelow. So far the details are sketchy. Although the deceased is still unidentified (as well as the two men arrested in connection), he's described as being "in his......