A Montgomery County mansion has made a nonprofit historic preservation agency’s list of endangered properties. It’s the Laverock Hill Estate (pictured here), a Neo-Georgian home that sits on 42 acres along Willow Grove Avenue in Cheltenham and Springfield Townships. It’s one of the county’s last surviving examples of a country home built in the gilded age of the early 20th Century. Preservation Pennsylvania says it has been vacant for about three years, the owner is not maintaining it, and it is deteriorating. The owner, Hansen Properties of Blue Bell, has proposed demolishing the mansion and putting up eight four-story condominium buildings with 216 units and 368 parking spaces.