{"geometry":{"type":"Point","coordinates":[-0.145018,51.519331]},"type":"Feature","properties":{"entry-date":"1970-02-05","start-date":"1954-09-10","end-date":"","entity":31683605,"name":"17-21, PORTLAND PLACE W1","dataset":"listed-building","typology":"geography","reference":"1227027","prefix":"listed-building","organisation-entity":16,"quality":"authoritative","documentation-url":"https://historicengland.org.uk/listing/the-list/list-entry/1227027","listed-building-grade":"II*"}}