NYC deed + mortgage history for a tax lot via ACRIS (Automated City Register Information System) legals dataset, keyed by BBL. Each row carries a unique documentId you can use to drill into the ACRIS master dataset (the master URL pattern is included in the response) for full details: parties, consideration amount, document type (DEED, MORTGAGE, ASSIGNMENT OF MORTGAGE, etc.). Use `property.nyc-parcel-lookup` first to convert an address to a BBL. Returns most-recent records first.