Buildings data from Allegheny County, Pennsylvania via  PASDA
Data Citation

Buildings data from the City of Austin, Texas via their GIS FTP site set up by the Communications and Technology Department.
A data disclaimer is written on the GIS FTP site.

Buildings data from the City of Baltimore, Maryland via the Mayor's Office of Information Technology.
Released into Public Domain.

Buildings data from the City of Bloomington, Indiana via their website. Source
Data Policy

Buildings data for the City of Boston via the  Boston Redevelopment Authority.
Data Policy

Buildings data for the Town of Chapel Hill, North Carolina via their website,  TownOfChapelHill.org.
GIS Data Disclaimer

Buildings data from the City of Chicago via  data.cityofchicago.org
Public Data

Buildings data from Clark County, Ohio via Digital Data Technologies, Inc.

Buildings data from Honolulu Land Information System (Holis), Department of Planning and Permitting, City and County of Honolulu.
Data Download Page

Buildings data from Kitsap County, Washington via their  GIS portal.
Data Policy

Buildings data from Lancaster County, Pennsylvania via  PASDA
Data Use Policy

Buildings data from the City of Midland, Texas via MidlandTexas.gov
GIS Data Information Page

Buildings data from Nanaimo, British Columbia, Canada. Available under a Creative Commons Attribution 2.5 license.

Lots data from  NYC PLUTO. Freely available to all New York City agencies and the public.

Buildings data from the City of Oakland via  Broadway/Valdez District Specific Plan.

Buildings data from the City of Petaluma, California (and multiple online sources, not necessarily controlled by the City of Petaluma) via  CityOfPetaluma.net
GIS Data Information Page

Buildings data from the City of Philadelphia via  OpenDataPhilly.org
Data Use Policy

Buildings data for the City of Raleigh, North Carolina via  Wake County's GIS page
Data Disclaimer

Buildings data from the City of Round Rock, Texas or its agents via  RoundRockTexas.gov
GIS Data Information Page

Buildings data from the City and County of San Francisco, California via  data.sfgov.org.
Creative Commons Zero License

Buildings data from the Metropolitan Planning Commission and Savannah Area GIS. Visit  thempc.org  and  SAGIS.org
Data Use Policy

Buildings data from the City of Seattle via  data.seattle.gov
Public Domain

Buildings data from the City of Spokane via their  GIS portal.
Data Disclaimer

Buildings data from the City of Steamboat Springs, Colorado via their  GIS page.

Buildings data from the City of West Sacramento, California via their GIS site.
Data Disclaimer (PDF)

There is no official endorsement or maintenance of this site by this city or county.