A Scottsdale developer announced Wednesday it hopes to begin construction of a 26-story condominium tower on the north shore of Tempe Town Lake early this year with sales opening in March. Developed by WestStone Communities, Onyx Tower would include 196 condos, ranging in price from the $300,000s to more than $1 million. The high rise “” with its solid black glass walls “” would sit near Rural Road and Loop 202.