Walk into the offices of East Greenwich Oil Company on Main Street and - except for the two desks busy with paperwork, computers, and phones - you would think you were in someone's living room. From the outside, you would not recognize it  if the last time you saw it was 2007 because EG Oil is one of several downtown locations that have been rehabilitated and are contributing to the area's increased charm. Steve deLisle, owner of EG Oil and the building that houses its office and two upstairs apartments, was faced with a mandate from the state to meet new fire code provisions added after the …