The Danforth: a streetcar suburb built in one window
Most houses on the Danforth’s side streets share one generation of floor, because they went up in the same few decades. The area developed from the 1910s through the 1930s as a streetcar suburb along the Danforth line, and the Prince Edward Viaduct linked the Danforth to Bloor Street in 1918; at the east end, the Town of East Toronto, a Grand Trunk Railway yard town, had been annexed to the city in 1908. On 26 February 1966 the Bloor-Danforth subway replaced the streetcar on Bloor and Danforth between Keele and Woodbine (TTC Coupler archive). The era-typical floor is strip hardwood over nailed plank subfloor.
The exceptions are easy to place. In the 1960s and 1970s apartment towers went up at Crescent Town, north of Danforth at Victoria Park, and at the Main Square complex south of Danforth at Main Street, and those stand on concrete floors, not joists. On the avenue itself, two-storey main street buildings line most of the frontage between Coxwell and Victoria Park (City of Toronto, Danforth Avenue Urban Design Guidelines).