As noted here, a developer has proposed some plans for the old Hanna-Barbera building at 3400 Cahuenga, some of which involve tearing the thing down. Some groups are trying to drum up support to save the structure as a landmark and as a tribute to Bill Hanna and Joe Barbera.
I worked in that building for years, and still have a tremendous affection for the early cartoons that were produced there — though more so for the ones H-B did before that, out of a studio down on La Brea. Still, I find it hard to see how any of us will be that much worse off if there's a big Ross Dress-for-Less shop on the property instead. Yes, it might be nice if that bit of history is preserved but to the extent that's true then the folks at Time-Warner — which owns Hanna-Barbera and is phasing out that brand name in favor of that of Cartoon Network — ought to just come up with the bucks to do this. I've lost track of whether they still have custody of 3400 Cahuenga or if they sold it to Universal, which I believe was reported some time ago to be acquiring it. Curiously, the article I'm linking to doesn't tell who does currently hold the deed. But if Time-Warner doesn't own it, they could — and they could put an actual, working cartoon studio or other Hollywood-themed business in there. I don't see why it should be up to anyone else to save the place. And if they won't do it, it probably isn't worth saving.