The redevelopment of the Schlumberger-Doll Research Center in Ridgefield could influence the redevelopment of an aging commercial district on Glover Avenue in Norwalk, along with other Fairfield County municipalities having similar opportunities. Photo: File Photo The office building at 100 Mill Plain Road in Danbury represented the largest commercial property sale of the second quarter in northern Fairfield County, according to Newmark Knight Grubb Frank.