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: 503 · U.S. COMMISSIONERS — OFFICES
An identified object is not a fully modeled object. Missing dimensions, locations and relationships remain explicit.
Research representation: boundary trace. Architectural checks: pending.
Fifth floor · Original mark: 503
Historical room number: 503
12 recorded properties
Still to extract or checkSource inventory is separate from the floor filters above. Select one drawing to inspect it; no drawing set is preloaded.