Stair A · basement to first floor · W221 diagnostic assembly
Research representation: provisional surface. Architectural checks: pending.
Basement · First floor · Original mark: A / W221
Placed inside the registered basement/first-floor Stair A traces for evidence review only; the W221-to-building transform is not accepted.
Source relationships · not a verified physical connection
- diagnostic representation of (derived, unreviewed): STAIR A
3 recorded properties
Still to extract or check- Accepted W221 building transform
- Exact stair width and wall-face offsets
- Landing construction and slab openings
- Stringers, soffits, nosings, rails and headroom
- Door/gate and Elevator No. 1 interfaces