The rather short listing for this townhouse at 431 Marlborough Street in the Back Bay-Kenmore borderlands describes it as a "stately home." Hard to argue with that. It's got 4 bedrooms; two and a half baths; a magnificent staircase to greet guests; and little finishes here and there that bespeak its Victorian roots. But, if it's stately, it's the stateliness of a faded era, like an old English country home about to be turned over to the National Trust; the runner whom the race outran, and all that. We're pretty sure it's one of the few townhouses in downtown Boston that we could ever say, without hyperbole, was a handyman's delight. First, though, come up with the $2,599,888.