The Firestone impact (via Newstead Farm) with racing their Upperville, VA homebreds has been modest in recent years. Most notable has been multiple graded stakes winner MIDDLEBURG (now retired) + having sold homebred WINCHESTER who won multiple G1s in 2010/11. They still have a few active runners who are winning such as multiple stakes winning homebred filly AMOIRE (10 4-4-0) to continue.
However they listed the 350+ acre farm (& the mansion) for sale today. One can only assume that means yet another Northern Virginia race breeder is exiting. Admittedly the price is steep enough that it likely won’t sell for a while but it suggests they’re winding down.
Outside of at best a handful of horses from Lazy Lane Farm there isn’t much left in that area with homebred racing. Hickory Tree Farm I don’t think has any activity, et al.