Gasoline fuel leak next door

I work in an office plaza and the suite next door are the landscapers for the plaza. They overfilled gas on their equipment so yesterday and today there has been a very strong gasoline smell in our office (we share a wall). Should I be worried about brain damge or long term effects because of this? I worked 8 hours yesterday we noticed it around late morning and the property manager confirmed it was because they overfilled with gasoline. I'm starting to get really worried because I've been breathing it in for over 8 hours