This photo of the Janet Terminal at Area 51 was provided by a source who wishes to remain anonymous. It was taken around 1985. The photo shows the entire Janet fleet at the time, six Boeing 737. Click in the image to enlarge.
Today's Area 51 Janet Terminal looks quite different, as can be seen in the February 2022 Google Earth photo below. Behind the new terminal buildings is the new ramp for the smaller Janet executive aircraft. The building to the left of the main ramp is the new dining hall, built in 2013. The building in the top left corner is the new base headquarters, built in 2005.