The City of Petaluma is located in southern Sonoma County, about 40 miles north of San Francisco. In the 1950s and 1960s, Petaluma experienced steady population growth from 10,315 in 1950 to 24,870 in 1970. By November 1972, unofficial figures placed its population at about 30,500. From 1964 to 1971, the following numbers of residential housing units were completed each year: 270 in 1964, 440 in 1965, 321 in 1966, 234 in 1967, 379 in 1968, 358 in 1969, 591 in 1970, and 891 in 1971. In 1970 and 1971 combined, builders won approval of 2,000 permits although only 1,482 were completed.
Alarmed by the accelerated rate of growth in 1970 and 1971 and the sprawl eastward, the City adopted a temporary freeze on development in early 1971 to study housing and zoning patterns. In 1972 the City adopted the Petaluma Plan. The Plan fixed a housing development growth rate not to exceed 500 dwelling units per year for projects of five units or more. This limit applied over the five-year period from 1972 to 1977. The Plan positioned a 200-foot-wide greenbelt around the City as a boundary for urban expansion. It established a Residential Development Control System using a point system for awarding permits based on conformity with general and environmental design plans, architectural design, and provision of low- and moderate-income units and recreational facilities. The Plan directed even division of allocations between east and west sections and between single-family and multiple units. It required infilling of close-in vacant areas first and mandated that 8 to 12 percent of approved units be for low- and moderate-income persons. The City also solicited Sonoma County to establish stringent subdivision controls outside the urban extension line.
The City described the Plan's purpose as ensuring development would occur in a reasonable, orderly, attractive manner and protecting its small town character and surrounding open space. The Construction Industry Association of Sonoma County argued, and the district court found, that the Plan was primarily enacted to limit Petaluma's demographic and market growth rate in housing and immigration of new residents. Housing permits had been allotted at the rate of about 1,000 annually in 1970 and 1971. The 500-unit limitation applied only to projects of five units or more and exempted all projects of four units or less. Expert testimony indicated that if the Plan were adopted by municipalities throughout the region, the shortfall in needed housing for the decade 1970 to 1980 would be about 105,000 units.
Two landowners and the Construction Industry Association of Sonoma County instituted suit under 28 U.S.C. §§ 1331, 1343 and 42 U.S.C. § 1983 against the City and its officers and council members. The district court ruled that aspects of the Plan limiting the natural population growth of the area unconstitutionally denied the right to travel and enjoined the City and its agents from implementing the unconstitutional elements. The order was stayed by Justice Douglas pending appeal.
The City appealed to the Ninth Circuit, challenging the district court's jurisdiction, the standing of the Association and Landowners, and the merits of the remaining claims on the record.
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