Alrighty, I looked up the Grand Rapids ordinances concerning helicopters. They prohibit operation in the Central Business District (CBD), Traditional Neighborhood City Center (TN-CC), and Traditional Neighborhood Transitional City Center (TN-TCC) zones during the hours of 11:00 p.m. to 7:00 a.m. and for operations exceeding specified noise levels and durations. See Title 9, Chapter 151, Article 5, Sec. 9.63 and Title 5, Chapter 61, Article 9, Sec 5.9.12 at
Grand Rapids Municipal Code. If unclear, contact the City of Grand Rapids or your lawyer...