|Aerial from early 1940's. Looking south towards downtown Greensboro|
|Proximity Mill, early 1950's|
And here is an aerial from Bing maps of the same area. As you can see, just one warehouse is left from the Proximity Mills site (White Oak Mill is shown in at the bottom and is the only mill still manufacturing denim).
New houses have been built on part of the site (upper left corner) and from looking at Register of Deeds website, Proximity was sold to a local salvage/demolition company during Cone Mills' bankruptcy back in 2004. They razed the mills, warehouses and office buildings and then sold the land to the real estate developer. My guess is that the reason the last remaining buildings haven't met the same fate is due to the extreme depressed state of real estate here in North Carolina.