Once home to a luxury steakhouse frequented by stars like Mae West, a century-old building on the outskirts of downtown Los Angeles went up in flames during the early morning hours Saturday. First opened in 1921, the Pacific Dining Car restaurant was housed inside a replica of a railway train car, lending a unique atmosphere to what would become a favorite of Old Hollywood. Over the next nearly 100 years, it was a fixture of fine dining in LA and a filming location for television shows and movies including 1974's "Chinatown" starring Jack Nicholson and Faye Dunaway and the 2001...