“Adrian Washington remembers riding his bike past the St. Elizabeths East campus as a kid. These days, he’s helping to build its future. Washington’s Neighborhood Development Co. is the latest developer to score the chance to build on the massive Southeast D.C. property, winning the right to develop a 421-unit mixed-use building near the Entertainment and Sports Arena. That would be a big opportunity for just about any developer in the city, but it feels especially meaningful for Washington…”