The origins of the Union Street School are founded in and outstanding private academy called The Washington Institute which operated from 1769 to 1865 as a private academy and for thirteen years more as a free school.  In 1865, the trustees of the Institute, decided that is should become a free school operated by the Village of Hackensack for the students within the district.

Unfortunately, during the morning of Saturday, November 25, 1950 a hundred mile and hour wind tore off sections of the building.  This misfortune marked the end of Union Street School.
In 1952 the building was demolished.

Information and image obtained from:
http://rkc.org/~rkc/test3/html/hbe/cbfcu/