KEENEVALLEY-A landslide severely damaged two homes in the upscale Adrian's Acres development on Porter Mountain. 184 Adrian's Acres Lane, the seasonal home owned by Elissa Ellsworth and Robert Machold of Philadelphia, Pa., was condemned by the town of Keene. Meanwhile, 166 Adrian's Acres Lane, the full-time residence of Charity and James Marlatt, was ruled uninhabitable. Officials from the U.S. Geological Survey took measurements last week which showed the hill was sliding one millimeter per hour. The landslide is believed to have been caused by rain and snowmelt.