| Pressley Associates studied non-intrusive barrier-free access solutions for the Glass House estate that preserve the character and features of the historic property, so individuals with varying physical abilities can navigate the sloping topography and reach the five principle historic buildings and galleries.
| Philip Johnson's estate was designated a National Historic Landmark in 1997. The buildings (including the 1949 Glass House), objects, and landscape contained in the site are recognized as monuments to post-war construction and for their association with Philip Johnson, who had a profound effect on 20th century architecture. Given the architectural significance of the built works and the evolution of the site, the recommendations for universal site access demonstrate a clear understanding of Johnson's design intent and negotiate the topography and landscape features in a compatible and sensitive manner. | National Trust for Historic Preservation