This appears to be what the listing calls the “office/media/recreation room,” which is perhaps where Stephen Schiff worked on New Yorker articles and screenplays:
And if that’s not enough bookshelf space for you, this bedroom boasts more:
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Judging from all the empty shelves, print may have died in the Schiff household a long time ago. If the Janians have larger literary holdings, they could stash some books in the bathroom too:
Finally, let’s check out the floor plan….