Scenes were also being filmed Tuesday at the Forwood House, a nearly 125-year-old Queen Anne's-style house at the intersection of Williams and Catherine streets.
Around 2 p.m. a couple of stretch limos with the presidential seal were parked in front of the house, as was a faux Virginia State Police cruiser.
Angela Revie, a Realtor with Keller Williams Realty of Bel Air, is working to sell the three-story, five-bedroom house, which had been subdivided into apartments until her brothers, Joe, Andy and Johnny Manzari III, made extensive renovations and converted it back into a single-family home.
"They wanted to keep the character and the charm of the Queen Anne's-style home," she said.
Revie's father, John Manzari Jr., designed a new stained-glass transom for the door as well.
Revie said the recently-renovated dwelling was spotted by a "House of Cards" location scout, and exterior and interior scenes were scheduled to be filmed on the property Tuesday.
"That's what makes Bel Air so desirable," she said of the historic homes. "I grew up in Bel Air, I would never want to leave; I just think it's a really neat town to be in and I think this will just showcase that."
Frado said the county does not have an estimate of how much economic activity "House of Cards" is generating locally, as those numbers have only been tallied statewide by the Maryland Film Office.
"Overall, it's been huge because I know they have hired tradespeople here out of the county. These are people who have business here in the county," Frado said.
The cast particularly enjoyed the Wegmans store in Abingdon, she noted.
A glimpse of Kevin Spacey at Buontempo's or Harford Mall might still be a pipe dream, though.
"You are not going to see him too far from the set," Frado surmised.