Dotloop Dotloop (a Zillow Group business) recently expanded their Cincinnati headquarters. Spread over three floors, this project included: multiple elevations of casework per floor solid surface tops wood trim and features a three-story staircase The stairs were the culmination of a significant effort in both the shop and the field. It was made of plain sawn white oak treads and landings laminated to 3” thick in three layers, and laminated for width. On their own, the stairs encompassed a total of more than 1,100 man hours. Each tread weighs approximately 120 lbs.