The city's plans were vigorously opposed by Trefann Court residents who were led by a young lawyer named John Sewell - who later became Mayor of Toronto. In response to Toronto city planners, Trefann Court residents created their own blueprint to save their neighbourhood. The residents' plan advocated restoring the existing housing stock wherever possible, and replacing dilapidated houses with new houses that would be in keeping with the neighbourhood. This plan was adopted by city council in 1972.

The battle over Trefann Court was historically significant in that it brought forth new urban planning ideas that advocated greater community involvement, less government interference and an enlightened interest in rehabilitating and preserving Toronto's historic neighbourhoods.