What kind of complex do you live in? It is not unheard of for apartment maintenance to purchase products in spray bottles that are intended for home use for this kind of thing. As such, you don't need any kind of license or certification to apply it. However, in a public area, they are creating huge liability issues if there is no warning.
Most places will hire a company to do their lawn fertilizing for them with licensed applicators and warning signs posted following use. Once a weed killer has been applied, it needs to sit for several hours then we watered into the ground for it to really have any effect. No one (not an animal nor a person) should walk on it for at least 24 hours after it has been watered in. All week killers are highly toxic to all living things!!
I would definitely complain. This is dangerous to you as well - perhaps if more people realized that it might make a difference. Good luck.
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