Establish the address for the correct year
Start with dated directories, newspaper advertisements, hospital annual reports, public-health reports, property records, or planning documents. A present-day search result is only evidence for the present-day location.
Use maps to test the documentary record
Sanborn maps show detailed building footprints, construction, property boundaries, and building uses for many U.S. cities. USGS historical topographic maps provide another dated geographic layer and can help align vanished structures with surviving streets.
Sources: Library of Congress — Sanborn Fire Insurance Maps · U.S. Geological Survey — Historical Topographic Map Collection
Search for maternity-specific language
Look for “maternity,” “obstetrics,” “labor and delivery,” “nursery,” “women’s pavilion,” and “birth center,” plus construction dates. Expansion announcements and floor plans can locate the relevant wing more precisely than a general hospital address.
Represent uncertainty explicitly
If the campus is certain but the wing is not, use a campus or building coordinate and label the ward unresolved. Research quality improves when a system can say “we do not know yet.”