3-3A Fitzroy Terrace was constructed in either 1871 or 1890. The earliest reference to a building on this site is in the 1871 City of Toronto Directory.

If constructed in 1871, 3-3A Fitzroy Terrace was first home to Benjamin Dean (c. 1834- 1922) who resided here until 1872.  Benjamin Dean was an English immigrant who arrived in Canada in the early-to-mid 1850s. Dean served with the 10th Royals Regiment in the Fenian Raids and later became a well-known military veteran in Toronto. Following the Fenian Raids, Dean was employed as a machinist with the Northern Railway, where he worked for over 40 years. He died in Toronto aged 88 in 1922.  

Following Benjamin Dean, 3-3A Fitzroy Terrace was home to Alexander Clark - an engine driver - who lived here until 1875. 

If constructed in 1890, 3-3A Fitzroy Terrace was first home to Duncan Morrison. Duncan Morrison was a labourer by trade. 

Of note is that there is a discrepancy in the Fire Insurance Plans between the 1884 and 1890 editions. This discrepancy depicts a similar building footprint to 3 Fitzroy Terrace, but in slightly different positions within the lot between these 2 editions. Further research is required to discern whether this is the same building just in slightly different places due to a cartographical error; whether the building was moved; or whether the building was demolished and a new building built circa. 1890. 

1890 was additionally the first year that Fitzroy Terrace appeared in the City of Toronto Directories. The present-day address of 3 Fitzroy Terrace has been used since 1890, although the property was severed into 3 and 3A Fitzroy Terrace at a later date. If predating 1890, it is possible that the east (primary) elevation of 3 Fitzroy Terrace was originally designed to face Kensington Avenue (formerly Vanauley Street) prior to the creation of Fitzroy Terrace.  

Of additional note is that the north side of Fitzroy Terrace is numbered backwards to the official City of Toronto address numbering system.