Recently sold: $4,030,000. 140 Saint Johns Place On a beautiful tree-lined North Slope block built in 1891-92, this enormous 20-foot-wide home complete with a 2 story extension boasts remarkably preserved detail: mantles, pier mirror, carved mahogany woodwork, pass-throughs and sinks, floors, molding, its all here. While you'll be surrounded by the best turn-of-the-century craftsmanship, you wont be burdened by 100-year-old technology: a magnificent extension features a charming skylight…