Consider this direct quote.
In 2018, some residents of the new Aqualina Bayside development on Toronto’s waterfront will enter through one door and other residents—who aren’t as wealthy—will use a different one. If this was New York City, they’d call that entrance the “poor door.” Some New Yorkers are outraged their city has approved a development on the Upper West Side that includes subsidized, affordable and market-rate units, because it will have segregated entrances and common areas, so, in effect, the wealthier won’t rub elbows with the poor who live in the building. aLet us hope this holds and it keeps being tweaked.
Sources / More info: Separate entrances: Are New York-style ‘poor doors’ here in Toronto already? | Metro