The Mountainside Middle School area had 18 sales during the week of Tuesday, May 7 to Monday, May 13, including including 11 single family homes for sale with an average list price of $1,515,182, 3 townhouses for sale with an average list price of $499,667, 3 condos for sale with an average list price of $409,450, and 1 lot for sale with a list price of $774,900.