Loads of Arab money in that area.
Interesting story time: when i first moved to the area back in the early 00s, there was an article in the WPost about a commercial construction project near Tysons corner. At one point in the project, a bunch of black SUVs appeared at the construction site out of the blue because the crew had apparently accessed some buried top-secret cable net work that was in none of the plans.
Back in the day, I was assigned to the Saudi account team of a former employer. Among the many stories I could tell, one is they WANT Jews handling their accounts, and they party really HARD when overseas, especially in Geneve.