The state of Virginia has entered into an agreement to sell the 78-acre Northern Virginia Training Center on Braddock Road to Erickson Living, which will redevelop it as an age-restricted retirement community. This will be the second Erickson community in Fairfax County, joining Greenspring in Springfield. Greenspring is 99 percent occupied with a waiting list of 1,000 prospective residents, the company said in a release. “More high-quality senior housing is needed in Fairfax,” Scott Sawicki,…