A rare slice of Gilded Age Philadelphia is about to change hands, and possibly its purpose entirely.
The Edward C. Knight Mansion, tucked just off Rittenhouse Square at 1629 Locust St., is heading to auction this month, Ryan Mulligan writes for the Philadelphia Business Journal.
Designed by Horace Trumbauer — the architect behind some of the city’s most storied addresses — the mansion was built in 1902 for railroad executive Edward C. Knight Jr…