Every dimension belongs to an object and a drawing. Original room numbers, object marks, printed values and source regions stay together—even when the answer is unresolved.
464 of 464 photographs have extraction records, containing 27,517 properties. Initial image review is not exhaustive extraction: 0 photographs have passed the full-region check. 66 numbered sheets are reconciled. Modeling and architectural registration are separate work; these counts do not establish a complete building.
Download the structured register (JSON)Object: Stair A B–1 · north flight · 9 treads
Printed values, calculations, image traces and observed counts are different kinds of evidence. “Verified” applies to the specific reading—not to the whole room or model.
9 count
North flight in the basement plan.
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.
0.875 ft
Printed tread going converted to feet.
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.
7.875 ft
Printed equality on the basement plan.
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.
Calculated from: w221-b1-flight-01-tread-count, w221-b1-flight-01-going
Source inventory is separate from the floor filters above. Select one drawing to inspect it; no drawing set is preloaded.