Most of the building and buying is happening within the city’s limits.
DC overtakes San Francisco with highest share of office buildings
News Building Design + Construction
Spokane was the Next Affordable City. Now, It's Too Expensive
Research, Resources, Guide, Commercial Real Estate, Thomas Kenna
D.C. Pushes Housing Makeover of Its Office-Heavy Downtown - WSJ
Spokane was the Next Affordable City. Now, It's Too Expensive
Washington Metropolitan Area Transit Authority (WMATA) Headquarters
Washington, D.C. – Travel guide at Wikivoyage
D.C. office market stats show historic vacancy - Washington
D.C. reclassifies city's largest vacant office building
Washington, D.C. – Travel guide at Wikivoyage
Washington, D.C. - Wikitravel
The Tulsa World Community Advisory Board (2014)