This chapter shall apply to all counties, except that:
1. It shall not apply to counties within the city of New York.2. It shall not affect the form of government in operation in a county which shall have heretofore adopted or shall hereafter adopt an alternative form of county government pursuant to any law other than this chapter, except that any such county may adopt any one of the alternative forms of county government provided in this chapter by the procedure herein provided.N.Y. Alt. County Gov't Law § 2