PDF maps of each block in San Francisco created by the San Francisco Office of the Assessor-Recorder. The maps display blocks and parcels with dimensions in feet.

[Resolved and Monitoring 11/30/2017]: we have fixed the issue but will continue monitoring. If you find the data inaccessible here, please let us know.

[Issue 11/14/2017]: We are currently investigating an issue that is causing the parcels to not load to the portal completely. In the meantime, you can get an alternative source file here: http://apps.sfgov.org/datafiles/view.php?file=sfgis/citylots.zip

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Updated nightly: The CityLots spatial data layer is a representation of the City and County of San Francisco's Subdivision parcels. Each of the 200,000-plus polygons has a unique BLKLOT identifier which is the Assessor Parcel Number (APN) Multiple level (condominium, live/work, et al) lots are represented as well, with their ground or base lot being the MAPBLKLOT key.