That story was actually a tad exaggerated. And it was to avoid them being used in a low budget SF film, as had happened with Forbidden Planet. An ape head still got stolen and used in the Joan Crawford movie Trog, and some spacesuit backpacks popped up on Doctor Who.

Many key costumes and props are still very much around. Some Kubrick kept hidden away at his estate. They have been touring the world as part of the Kubrick Exhibition. I saw them with my own eyes in L.A. last summer.

In any case, a 2001 sequel was not being contemplated in 1970. Arthur C Clarke didn't even pen a book sequel until the early 80's. And Stanley didn't mind the 2010 movie, either.

Five minutes in google reveals there is an MGM building at that address, that was built in 2009. ;)