1951 by the Roman Catholic Diocese of Buffalo, with plans to turn the complex into a summer retreat for their priests, it remained empty. 1951 was also the year Graycliff was sold to the Piarists, a Catholic teaching order. The complex was purchased privately in 1955 by architect Sebastian Tauriello, thus saving the house from demolition. It was converted into three apartments, the grounds sub-divided, with the carriage house, conservatory, and pergola in ruins at the time of the private purchase, demolished, and a pair of apartment buildings constructed in the 1960s. In 1967 the complex was purchased by the University at Buffalo, for use as the university president's residence. The university continued the sub-division with the sale of The Barton House in 1967 and the gardener's cottage soon after. The university attempted restoration of the Martin House, although this consisted mainly of slight modernizations and the location of several pieces of original furniture. The complex was added to the National Register of Historic Places in 1975, and became a National Historic Landmark in 1986. Restoration The Martin House Restoration Corporation (MHRC), founded in 1992, is a non-profit organization with a mandate to restore the complex to its 1907 condition and to open it as a public historic house museum. The Barton House was purchased on behalf of the MHRC in 1994 and the title to the Martin House was transferred from the University at Buffalo to the MHRC in 2002. The restoration began with the Buffalo firm Hamilton Houston Lownie Architects (HHL) being commissioned to restore the roof of the Martin House. The Gardener's Cottage was purchased in 2006, and the demolished carriage house, conservatory, and pergola were reconstructed and completed in 2007. The $50 million restoration project was completed in June 2017. It was the first time that a demolished Wright structure had been rebuilt in the United States. One of Richard Bock's sculptures, Spring, now located in the Bock Museum at Greenville College, was copied in 2008. Currently the MHRC operates guided public tours and present educational programs for volunteers and the general public. In 2008, the Gardener's Cottage was finally included on the tours of the complex. The Eleanor & Wilson Greatbatch Pavilion Visitor Center, designed by Toshiko Mori, opened March 12, 2009. In June 2017, the unveiling of the Wisteria Mosaic Fireplace, a 360-degree work of art consisting of tens of thousands of individual glass