When this Riverside Drive mansion first appeared on the market last September, it was asking $19.75 million, a price that would have vaulted it to the near-top of the list of the Upper West Side's most expensive homes. Alas, it looks like it won't break that record anytime soon: The grand townhouse reappeared today with a new listing (from Brown Harris Stevens) and a $2 million price chop; it's now asking $17.95 million. The nine-bedroom, six-bathroom semi-attached home was built in 1901 and designed by Robert D. Kohn. It earned a spot on the National Register of Historic Places, perhaps in part because of its over-the-top interiors: there's an original mahogany staircase that's lit from above by a Tiffany stained-glass skylight, along with Juliet balconies, eight wood-burning fireplaces, and decorative moldings. There's also a large backyard and a roof terrace, because why not?