A sinkhole opened near 38th and Farnam streets in Omaha Sunday morning, prompting city crews to evacuate nearby buildings.City crews received a call just before 8:30 a.m. The sinkhole left the sidewalk completely gone from the front of an unoccupied building along the streetcar construction on Farnam Street. Shortly after noon, crews told neighbors and employees it was safe to re-enter neighboring buildings."One of the things they talked to me a…