More than 100 acres of undeveloped land in Roanoke could one day become a site for future housing and retail. City leaders have started initial talks on the long-term vision for the privately-owned Evans Spring property along Interstate 581. The properties form the largest undeveloped sites within the city limits. Proponents of development say it could be a huge economic boost to the city. But citizen groups contend the forested land should instead become park space.