Import Cupertino buildings into OpenHistoricalMap

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The City of Cupertino maintains a GIS layer of building footprints. This dataset is in the public domain as a work of a California government agency. This layer has already been imported into OpenStreetMap, but it could also be a source for OpenHistoricalMap thanks to its Year_Built field.

Year_Built is documented as “The year the building was built”, but I don’t think it’s quite that straightforward. Most of the dates seem plausible, but some seem far too new, as if they’re actually based on construction permits for remodeling or expansions. Maybe that’s OK, because OHM represents each iteration of a building as a separate feature anyways. But there are also some nodata values, like Apple Park being built on December 30, 1899, at midnight UTC.