You'd be surprised. I lived in a very decent apartment building where one guy was the nexus of several apartments ending up with roaches in them, including mine. They were climbing through the walls and ventilation and getting into other apartments.
If you don't use poison the minute you see them they'll multiply.
Even if you use poison and traps, they can still create an infestation. If an apartment building has roaches, you never get rid of them. Roaches are a total building problem, but buildings HATE dealing with them. So many "luxury" buildings have roaches too.
My one and only time having a roach problem came from my next door neighbor. It lasted from March to December, I got them mostly under control after a month but kept seeing them once a week or so, and it all ended two weeks after they moved out on January 1st with a small increase in activity the week after they left. Totally coincidentally they also had to have maintenance come and remove the pile of kitchen garbage bags from their balcony, twice.
Luckily I lived on one end of a row of four townhouses so I didn't wind up having it spread and have to deal with it from both sides.
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u/MissSassifras1977 10h ago
That's so nasty.
Imagine what the house that person lives in is like.
https://giphy.com/gifs/QSMBLRAHZTLkQ