Tread count
11 treads11 count
East flight in the basement plan; the two-flight tread total reconciles with 22 risers.
Drawing notation: BASEMENT FLOOR PLAN / UP 22 R / 9 TREADS @ 10 1/2" = 7'-10 1/2" / MARBLE TREADS AND RISERS / BRONZE HANDRAIL
Basement Stair A plan around Elevator No. 1.