Photo: Home on Longdford Street, 2010, photo by wikipedia username: Smallbones; public domain, accessed December, 2019.
Greenbelt Knoll was nominated for the National Register of Historic Places in 2010. Portions of the content on this web page were adapted from a copy of the draft nomination document. [‡] Greenbelt Knoll was placed on the Philadelphia Historical Register in 2006.
Greenbelt Knoll is a nine-acre development of 18 modest frame, one-story Modern houses constructed in 1955 and 1956 in suburban northeastern Philadelphia [Holmesburg neighborhood]. The single-family homes are clustered efficiently along Longford Street, a cul-de-sac, on lots of approximately one-third acre each. The asphalt-paved cul-de-sac is accessed via the south side of Holme Avenue and is approximately 500 feet in length. It follows a north-south ridgeline and is bordered by concrete sidewalks. The development is heavily wooded and is bordered on three sides by the Pennypack Park Greenway. The siting of the houses and division of parcels was determined by the topography of the knoll, which drops off considerably to the west and south. Placement of the houses was intended to limit the removal of trees and incorporate the existing landscape into the design. Seventeen of the existing homes are considered contributing; one home was completely rebuilt following a fire and is considered non-contributing
Greenbelt Knoll is significant or association with the development of integrated housing in Philadelphia during the post-World War II period. Greenbelt Knoll was the second of Morris Milgram's Philadelphia area integrated housing developments; it reflected what became a flashpoint for civil rights in the post-war period. Greenbelt Knoll was a small part of a serious nationwide attempt to resolve the worsening problem of decent minority housing. It was one of the few attempts to create integrated working and middle class housing, and one of the even smaller number to succeed. It is also locally significant for association with Morris Milgram, one of the leading proponents of fair housing and the developer of Greenbelt Knoll and other planned integrated housing projects across the country. Milgram made Greenbelt Knoll his residence from the time of its construction until 1976.
Greenbelt Knoll was designed by the prominent firm of Montgomery & Bishop with architect Harry Duncan, landscape architect Margaret Lancaster Duncan, and consultant Louis I. Kahn, the houses and landscape at Greenbelt Knoll are excellent examples of the organic vein of mid-century Modern architecture. Set in a wooded area and isolated from its neighbors, Greenbelt Knoll is one of the most important concentrations of residential Modernist buildings in Philadelphia.
The houses in Greenbelt Knoll were constructed during 1955 and 1956. The house at 4 Longford Street, the model house for the development, was erected first. The Department of Licenses & Inspections issued zoning and building permits for the model house in the spring of 1955. Greenbelt Knoll won several awards for design excellence. For example, the American Institute of Architects, House and Home, Better Homes and Gardens, and the National Broadcasting Corporation bestowed its Homes for Better Living award on the development. Also, Philadelphia's Mayor Richardson Dilworth, an ardent advocate of exceptional planning and design, conferred a City of Philadelphia Tribute on Montgomery & Bishop. He gave the tribute "for the design of Greenbelt Knoll Homes, which ... brought new standards of contemporary residential architecture to Philadelphia."
‡Charles Fuller and Art Friedman, Greenbelt Knoll residents, and the staff of the Pennsylvania Historical and Museum Commission, Greebelt Knoll Historic District, Philadelphia County, PA, nomination document, 2010, National Park Service, National Register of Historic Places, Washington, D.C.