Top outside drawers have felt-lined bottoms, all others have veneer bottoms, Door encloses an adjustable shelf with ventilation cutouts, Center drop-front drawer has ball-bearing extension guides, an electric/USB power outlet, and wiring access cutout, Outside drawers have dovetail joinery and ball-bearing extension guides, Bottom file drawers accept letter or legal size files, L-Desk: 70" long x 24" deep x 30" high, L-Return: 45 3/4" long x 24" deep x 30" high, Center drop-front drawer has ball-bearing extension guides and wiring access cutout