215.1 Land supply in the District of Columbia includes "pipeline" sites, vacant infill sites, underutilized sites, large sites, and other sites. These categories are mutually exclusive, meaning there is no double counting between them.

215.2 Pipeline sites are sites where specific development projects are already planned or under construction. Such sites comprise over 1,300 acres in the District. They represent 60,000 housing units and about 42 million square feet of non-residential space. The degree of certainty that these projects will be built by 2030 is relatively high.

215.3 In 2013, the District undertook a comprehensive analysis of land-use capacity as part of its joint study of the Height of Buildings Act with the National Capital Planning Commission. The analysis looked at the unused potential capacity from the development of privately owned vacant and underutilized sites. Vacant infill sites comprise about 505 acres in the District and are not associated with any particular project or proposal. They are generally less than ten acres and include a mix of privately-owned properties and publicly owned sites. Some 426 acres of this land are residentially zoned, including about 121 acres of multi-family zoned land, and 306 acres of land zoned for single family and rowhouses. About 53 vacant acres are commercially zoned and 23 vacant acres are industrially zoned. While vacant lots occur in all parts of the city, about 30 percent of the city's vacant land is located east of the Anacostia River.

215.4 Underutilized sites comprise about 849 acres. For the purposes of the Comprehensive Plan, these are defined as privately owned properties zoned for either multi-family residential, commercial, or industrial uses where the property improvements represent less than 30 percent of the potential built capacity under the Comprehensive Plan's land-use designations and zoning. An example is a one-story storefront on a property where four or more stories are permitted. This does not necessarily mean these uses should be displaced - it simply means the private market will create pressure to replace them over time. The underutilized sites tend to be clustered along mixed-use corridor streets such as Wisconsin, Connecticut, Georgia, Martin Luther King Jr, Nannie Helen Burroughs, and New York Avenues, and Benning Road.

215.5 Large sites in the District include about a dozen properties or clusters of adjoining properties, with the potential for reuse during the next 20 years. They range in size from 25 acres to over 300 acres. They include sites that already contain extensive development, like DC Village and Reservation 13, and sites that are largely vacant, such as Poplar Point and the McMillan Reservoir Sand Filtration site. These sites hold many possibilities for the future, from large mixed-use communities to new parks and open spaces, public facilities, and infrastructure. In

total, the large sites represent about 1,500 acres. Some have already been master-planned for new uses; the future of other sites has yet to be determined. Some are federally owned, and some are owned by the District. The Office of Planning estimates that federally owned sites will account for less than 10 percent of the District's job and household growth through 2025.

215.6 There are many other sites in the District where development could occur. Despite an overall decrease in the number of vacant buildings, some of these buildings can be renovated and others are likely to be demolished and replaced. There are also freeways and railyards where development could occur in the air rights above the existing uses. There are at least four aging housing projects that have been identified as possible 'new communities.'

215.7 Table 2.1 summarizes vacant and underutilized commercial land within the District and provides an estimate of potential additional development that these lands could accommodate based on existing zoning.

215.8 Table 2.1 : Potential Additional Development on Vacant and Underutilized Lands Citywide

Land Use	Acres	Residential	Mixed-Use		PDR Non- Residential*
		Units	Units	Non-Residential*
Vacant Sites	505	9,100	4,200	9	4
Underutilized Sites	849	14,400	33,100	25	23
Sub-Total	1,354	23,500	37,300	34	27
Total			60,800		61

1. Millions of Square Feet

Source: Office of Planning, 2017

SOURCE: District of Columbia Comprehensive Plan Act of 1984, effective April 10, 1984 (D.C. Law 5-76; 31 DCR 1049 (March 9, 1984)); as amended by District of Columbia Comprehensive Plan Act of 1984 Land Use Element Amendment Act of 1984, effective March 16, 1985 (D.C. Law 5-187; 32 DCR 873 (February 15, 1985)); as amended by District of Columbia Comprehensive Plan Amendments Act of 1989, effective May 23, 1990 (D.C. Law 8-129; 37 DCR 55 (January 5, 1990)); as amended by District of Columbia Comprehensive Plan Amendments Act of 1989 NCPC-Recommended Amendments, and Closing of Public Alleys in Square 669, S.O. 88-452, Act of 1990, effective May 23, 1990 (D.C. Law 8-132; 37 DCR 2213 (April 6, 1990)); as amended by District Government Land Use Temporary Amendment Act of 1994, effective October 1, 1994 (D.C. Law 10-190; 41 DCR 5360 (August 12, 1994)); as amended by Comprehensive Plan Amendments Act of 1994, effective October 6, 1994 (D.C. Law 10-193; 41 DCR 5536 (August 19, 1994)); as amended by District of Columbia Comprehensive Plan Act of 1984 Land Use Amendment Act of 1994, effective March 21, 1995 (D.C. Law 10-235; 42 DCR 30 (January 6, 1995)); as amended by Technical Amendments Act of 1996 effective April 18, 1996 (D.C. Law 11-110; 43 DCR 530 (February 9, 1996)); as amended by Second Technical Amendments Act of 1996 effective April 9, 1997 (D.C. Law 11-255; 44 DCR 1271 (March 7, 1997)); as amended by Comprehensive Plan Amendment Act of 1998, effective April 27, 1999 (D.C. Law 12-275; 46 DCR 1441 (February 19, 1999)); as amended by Technical Amendments Act of 1999, effective April 12, 2000 (D.C. Law 13-91; 47 DCR 520 (January 28, 2000)); as amended by Comprehensive Plan Amendment Act of 2006, effective March 8, 2007 (D.C. Law 16-300; 54 DCR 924 (February 2, 2007)); as amended

by Technical Amendments Act of 2008, effective March 25, 2009 (D.C. Law 17-353; 56 DCR 1117 (February 6, 2009)); as amended by Comprehensive Plan Amendment Act of 2010, effective April 8, 2011 (D.C. Law 18-361; 58 DCR 908 (February 4, 2011)); as amended by Comprehensive Plan Framework Amendment Act of 2019, effective August 27, 2020 (D.C. Law 23-127; 67 DCR 001360 (February 14, 2020)).