New York City Council yesterday approved landmark designation for the historic West Park Presbyterian Church at Amsterdam Ave. and 86th St. According to the New York Times, preservationists have waged a 20-year battle to save the Romanesque Revival building which has been closed for two years because of physical deterioration. Church leaders wanted to tear down part of the building and develop the site. The church's pastor, Rev. Dr. Robert L. Brashear said: "Forced landmarking has the effect of imposing the governmental idea of mission on the congregation. There is a profound church-state issue here." It will cost $11 to $12 million to restore the church.