IELEV Private 125. Yıl Middle School was founded in 2006 aiming to reflect and bear the stamp of the values and culture of Istanbul Boys High School to the new generations. As the second school of İELEV Educational Institutions, it was first named Acıbadem Private Primary School. In the 2009-2010 academic year, its name was changed to IELEV Private 125.Yıl School to honor the 125th year of the foundation of Istanbul High School. Along with the new name, the school moved to the new premises in Nişantepe.