The join keys that recur across agencies — detected in every domain's JSON Schemas. Geography keys (borough, council district) are near-universal; the property keys (BBL/BIN) are the real connectors that could stitch Buildings, Finance, Housing, Planning, and 311 together. This is the case for nyc-commons, in data.
How many of the 70 domains carry each key. ■ property · ■ identity · ■ geography
Domains sharing the most property/identity keys — the natural first integrations.