These footprint extents are collapsed from an earlier 3D building model provided by Pictometry of 2010, and have been refined from a version of building masses publicly available on the open data portal for over two years.The building masses were manually split with reference to parcel lines, but using vertices from the building mass wherever possible.These split footprints correspond closely to individual structures even where there are common walls; the goal of the splitting process was to divide the building mass wherever there was likely to be a firewall.

An arbitrary identifier was assigned based on a descending sort of building area for 177,023 footprints. The centroid of each footprint was used to join a property identifier from a draft of the San Francisco Enterprise GIS Program's cartographic base, which provides continuous coverage with distinct right-of-way areas as well as selected nearby parcels from adjacent counties. See accompanying document SF_BldgFoot_2017-05_description.pdf for more on methodology and motivation https://data.sfgov.org/d/72ai-zege/about

To get this data as a File Geodatabase, go to https://data.sfgov.org/d/asx6-3trm

These department codes are maintained in the City's financial system of record. Department Groups, Divisions, Sections, Units, Sub Units and Departments are nested in the dataset from left to right. Each nested unit has both a code and an associated name.

The dataset represents a flattened tree (hierarchy) so that each leaf on the tree has it's own row. Thus certain rows will have repeated codes across columns.

Data changes as needed.

San Francisco Basemap Street Centerlines

A list of officially valid street names contained in the City's GIS Basemap

[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

++++++++++++++

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.

This dataset is a representation of each Assessor Block in the City. Each block is comprised of one or more subdivision lots.

All active addresses from the City's Enterprise Addressing System, including sub-addresses, such as units. Includes references to parcel and street centerline data. Updated nightly.See EAS Base Addresses for base addresses not including units.

Active base addresses from San Francisco's Enterprise Addressing System, This does not include sub-addresses, such as units. Updated nightly. See eas_addresses_with_units for records with units.

Recorded parcel geography, both active and retired, with date recorded parcel was added, date recorded parcel was dropped/retired, date was added, dropped or altered re map layer. Contains geography created since the inception of the basemap in 1995, with some exceptions.

A list of Street Segment and Intersection (CNN) changes including new, dropped, realigned, divided and split records.