I believe there are a few yards throughout Queens where unused rigs (both spares and old rigs) are stored. Retired rigs are stripped down and either sold through used rig companies or scrapped entirely.
if you look in the area of the e-one rig closer to 55th ave you spot a green truck which is probably a fuel tender then a rearmount aerial the rig im questioning is the next one its big and very boxy anyone no what that rig is?
I believe that box looking rig is an old decon unit/decon support unit. You can find it here http://fdnytrucks.com/files/html/specialunits/soc.htm (credit to Mr. Martinelli) scrool down to the bottam. It is an old Mack CF converted by the shops.