Section 11-B304. RULES OF MEASUREMENT FOR GROSS FLOOR AREA (GFA)

 

304.1GFA is measured from the exterior faces of exterior walls and from the center line of walls separating two (2) buildings.

 

304.2Non-residential floor area shall be the total GFA of a building not dedicated to one (1) of the following uses: 

 

(a)Residential;

 

(b)Community-based institutional facility;

 

(c)Emergency shelter;

 

(d)Lodging use with less than thirty (30) rooms;

 

(e)Guest rooms and service areas of a lodging use with thirty (30) or more rooms; or

 

(f)Education uses that are operated or chartered by the District government.

 

304.3The GFA of a lodging use dedicated to function rooms, exhibit space, commercial adjuncts and any other use not considered guest room or service area shall be considered non-residential floor area.

 

304.4For a building entirely detached from any other building, calculation of GFA for the portion of a story located partially below finished grade shall be as follows:

 

(a)Measure the portions of the perimeter of the story located partially below finished grade that have a height greater than or equal to four (4) feet, when measured between the finished grade and the ground floor of the story above;

 

(b)Measure the total perimeter of the story located partially below finished grade;

 

(c)Divide the distance of the result of paragraph (a) by the distance of the result of paragraph (b); and

 

(d)Multiply this result by the total floor area of the story located partially below finished grade.

 

304.5For a building attached at any point to a neighboring building, GFA of the portion of a story located partially below finished grade shall be calculated as follows:

 

(a)Establish a line between the midpoint of a building façade facing the nearest street at finished grade and the midpoint of the opposite building façade at finished grade;

 

(b)Determine the portion of this line where the distance between it, and the ground floor of the story directly above, is greater than or equal to six (6) feet;

 

(c)Project a perpendicular line from the point along the line described in paragraph (b) to the exterior walls of the building; and

 

(d)Measure the floor area that is between the projected perpendicular line and the other portions of the story with a height greater than or equal to six (6) feet, when measured from the perpendicular line to the ground floor of the story above.

 

 

authority

§ 1 of the Zoning Act of 1938, approved June 20, 1938 (52 Stat. 797, as amended; D.C. Official Code § 6-641.01 (2012 Repl.)).

source

Final Rulemaking published at 63 DCR 2447, 2650 (March 4, 2016 – Part 2).