Aw, shucks, fellas. Ubi = where, ibi= there. So the twin to "ubiety" could be "ibiety". So Stein's phrase could be: There's no ibiety there. Incidentally, she was talking about Oakland, CA, so long ago it must have been pretty small almost a hundred years ago, compared to Paris, which Stein loved so much.
But "whereness" doesn't come out as well. "Hic" is adv. here, "Hac" is adj. here. Hicety, Hacety. Just don't have any class. A hic jacet was special garment for drunks.
Ubiety suffuses Milosz's work, though he says that `whether I wanted this to happen or not, the landscapes of California have merged with the landscapes of Lithuania.'" David Kipen, ABCs of Milosz -- A Life in Letters, The San Francisco Chronicle, Mar 21, 2001.
Sinehow it seems to me that a guy who thinks California can be merged with Lithuania doesn't know what "ubiety" means.