Fair Lane, Clara and Henry Ford's fifteenth and final residence, was designed and built with William Van Tine as architect of record, following earlier designs by Von Holst and Fyfe of Chicago and their representative Marion Mahoney, who laid the foundation of the Main Residence. The home contains 31,770 square feet and 56 rooms, and although the estate originally covered 1,242 acres, it now retains 17 acres of gardens and grounds designed by landscape architect Jen Jensen. Completed in 1916, the house featured modern amenities and major technological advancements of its time and was built to last for generations, but years of use and the forces of nature have caused deterioration. Water, important in the estate's original siting, has become its greatest threat, causing many of the preservation problems affecting the buildings and interiors. Original drainage lines have been inspected, cleaned, and replaced when necessary, and although the Main Residence roof was replaced in the 1990s, the flat roofs were compromised. Using historic photographs and consultation with tiling experts, a new roofing system with monitoring equipment is being installed. In 2014, Quinn Evans Architects, SmithGroupJJR, and Henry Ford Estate staff researched and planned restoration work on the Main Residence to improve visitor experience and protect against water damage, including new underground storm water lines, replacement of missing or damaged copper gutters and downspouts, reconstruction of three tile flat roofs and the Kitchen Service Courtyard, reconstruction of failed stone walls at the Music Room Terrace and various window wells, and reconstruction of metal safety railing at multiple locations, with work beginning in early 2015 and scheduled for completion by the end of 2015.