Constructing the Atlanta Beltline has sometimes been like piecing together a puzzle, particularly as it weaves its way through residential neighborhoods in the northern parts of the city.  But the final piece has been found, with a 0.2-acre purchase in northwest Atlanta marking the final piece of land needed to eventually complete the 22-mile loop around the city.  That’s the last of nearly 200 land purchases and a defining milestone that will lead to the Beltline’s ultimate completion in (hopefully) 2030.  RISING…