. . .The Rochester property owners and taxpayers—Vinkey, Reichert, Warth, Harris, and Ortiz—claimed that because of Penfield’s exclusionary practices, the city of Rochester had been forced to impose higher tax rates on them and other similarly situated than would otherwise have been necessary. The low- and moderate-income, minority plaintiffs—Ortiz, Broadnax, Reyes, and Sinkler—claimed that Penfield’s zoning practices had prevented them from acquiring, by lease or purchase, residential property in the town, and thus had forced them and their families to reside in less attractive environments. To relieve these various harms, petitioners asked the District Court to declare the Penfield ordinance unconstitutional, to enjoin the defendants from enforcing the ordinance, to order the defendants to enact and administer a new ordinance designed to alleviate the effects of their past actions, and to award $750,000 in actual and exemplary damages.
On May 2, 1972, petitioner Rochester Home Builders Association, an association of firms engaged in residential construction in the Rochester metropolitan area, moved the District Court for leave to intervene as a party- plaintiff. In essence, Home Builders’ intervenor complaint repeated the allegations of exclusionary zoning practices made by the original plaintiffs. It claimed that these practices arbitrarily and capriciously had prevented its member firms from building low- and moderate-cost housing in Penfield, and thereby had deprived them of potential profits. Home Builders prayed for equitable relief identical in substance to that requested by the original plaintiffs, and also for $750,000 in damages. On June 7, 1972, Metro-Act and the other original plaintiffs moved to join petitioner Housing Council in the Monroe County Area, Inc., as a party plaintiff. Housing Council is a not- for-profit New York corporation, its membership comprising some 71 public and private organizations interested in housing problems. . . .