building age in quebec

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Hello, i was wondering if there is anyone knowledgeable about the differences between buildings built at different time periods in quebec (and rest of canada, for that matter). 

for example, what problems should i be looking out for in a building constructed around 1900, vs a building constructed in the 50's or 60's? are there certain features of old buildings i should be more concerned with?

i ask because there's quite a few old building on the market in my area (see example below, built in 1912)
https://www.centris.ca/en/5plex~for-sale~sherbrooke-les-nations/21547571?view=Summary&uc=1

they seem like good deals from a cashflow perspective, but i'm suspicious of the age...although i suppose a building can last indefinitely assuming the foundation is solid and other parts are regularly maintained.

thanks