Know that area very well...
I grew up 5-6 miles from there, and after college when we moved out to the country we both commuted down Greenspring Ave. to Towson and the City for 20 years. Very wealthy area, horse farms &c, Sagamore Farms owned by the Vanderbilts where Nothern Dancer came from is right there, the Md Hunt Cup is held there on the Mathias farm, and many well-off Jewish families just to the south. Probably had maids that did the dishes, and often Kosher houses had multiple dishwashers, maybe that's the case here. In any event folks in that area can afford the best.