The house was eventually demolished in 1961 and the Etobicoke Board of Education built and opened Kingsmill (named after the Old 'King's' Mill) on September 3, 1963 at cost of $982,210.00.

Designed by architect Gordon Adamson, the school building featured 8 classrooms 1 art room, 11 multiple shops (wood working, machine, sheet metal, general, horticulture, art, grooming-barbering-hairdressing, sewing and infant care, home economics, 2 boys' occupations) tailored for students with slow learning disabilities, a cafetorium, double gymnasium, and library.

[2] In 1972, Kingsmill hosted Humber College's women's basketball team due to lack of home games at their campus.

[4] An accommodation review occurred in 1987 when EBE originally decided to close Kingsmill and Humbergrove Secondary School in April 1987 since enrolment went down at the 207 mark in 1987 and 191 in 1988.

At the April 28, 1988 meeting with the Metropolitan Toronto School Board and the MSSB, the Kingsmill property has been perpetually leased for 99 years which was approved in November 1988.