The Blake mansion is huge and has a beautiful garden and a driveway. Daphne told Fred Jones they have only two maids, a butler and a grounds-keeper.
Scooby-Doo! The Mystery Begins
It's where they took the grounds-keeper's van to to head to the vice-principal's home. Daphne explained that the groundskeeper's van would become her new car once she turned 16, while her family would be getting the groundskeeper a new car.