Greenbelt Knoll

Greenbelt Knoll Historic District
Pennsylvania state historical marker
House in Greenbelt Knoll
Location1–19 Longford St., roughly bounded by Holme Ave. and Pennypack Park Greenway, Philadelphia, Pennsylvania
Coordinates40°3′22.68″N 75°1′19.56″W / 40.0563000°N 75.0221000°W / 40.0563000; -75.0221000
Area9 acres (3.6 ha)
Built1952–1957
ArchitectMontgomery & Bishop, Louis Kahn and Harry Duncan
Architectural styleModernist
NRHP reference No.10001030
Significant dates
Added to NRHPDecember 14, 2010
Designated No parameterJune 9, 2006
Designated No parameterJune 10, 2007

Greenbelt Knoll is a residential development in the Northeast section of Philadelphia, Pennsylvania. Planned and built from 1952 to 1957, it is notable as the first planned racially integrated development in Philadelphia and among the first in the United States.

The developer, Morris Milgram, a leader of the open housing movement, required that 55 percent of the homes be sold to whites, and 45 percent to non-whites. The first house sold in 1956 for $20,000. The isolated little neighborhood included its own swimming pool, which was filled in circa 1985, leaving no trace above ground.