The slender townhouse at 60 Chestnut Street in Beacon Hill is freakin' gorgeous: a lugubrious staircase connecting stately rooms (even the kitchen!) with original detailing dating from the Monroe administration. It has four bedrooms, four and a half bathrooms, 2,815 square feet and—count 'em—nine fireplaces. And now it's under $4 million, with a price-chop last week of $300,000. It last sold way back in 1989, for a cool mill.