As you read this, another handsome Italianate villa is being ripped apart in the Spruce Hill section of West Philadelphia, this time at 41st and Sansom. Its demise comes on the heels of a big loss around the corner on Chestnut Street, where a stately row of identical, Civil War-era townhouses lost four of its members. Not long ago, developers gouged a hole in the middle of a picturesque block of Victorian twins on 45th Street, the kind with deep porches supported by classical columns. In each case, flimsy student housing is taking the place of the lost 19th-century buildings.