Kathy Heffernan, et al v. Missoula City Council, et al

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The Missoula City Counsel, the City of Missoula, and the Mayor, (collectively "City") and Muth-Hilberry, LLC ("developer") appealed a district court determination that found that the City was arbitrary and capricious in approving a zoning and preliminary plat for a subdivision known as Sonata Park located in Rattlesnake Valley, Montana. At issue was whether neighbors, several parties opposed to the subdivision, and the North Duncan Drive Neighborhood Association, Inc. ("Association") had standing. Also at issue was whether the district court erred in striking affidavits filed by the developer and the City in connection with their motions for summary judgment. Further at issue was whether the 1989 Sunshine Agreement between the City and the developer's predecessor in interest superseded the City's growth policy. Finally at issue was whether the City's decision in Sonata Park was arbitrary, capricious, or unlawful. The court held that the neighbors had standing to sue in their own right and that the Association had associational standing to proceed on behalf of its members. The court also held that any error made by the district court in granting the neighbor's motion to strike the developer's affidavit was harmless. The court further held that the Sunlight Agreement did not supersede the City's growth policy where the Sunlight Agreement could be void ab initio and did not appear to guarantee certain density. The court finally held that substantial compliance was still valid and that a government body must substantially comply with its growth policy in making zoning decisions and that the City's decision to approve Sonata Park was arbitrary, capricious, and unlawful.