CSF steel is pretty big, the building is about 700 meter long by 180 large, while jenkins is about 350 x 350 meters. The land of CSF is bigger than Jenkins. Singer is indeed very big land and building, while mount sinai hospital building is very smal compared to the industrial monsters.
Here is the aerial of Jenkins:
and the one of CSF:
both are viewed from 750 meter high point of view, from this website:
http://www.navurb.com/ you need special plug in for Java 2 to view the map, click "orthophoto" to see it in pictures.
Java 2 can be found easily with google, sorry I don't have a link.