1723.1 With the exception of a building located on Lot 158 in Square 515 for which a building permit has been received within nine (9) months prior to or after [the effective date of this section], or any portion of a building that existed on the effective date of this section] that is subsequently designated a historic landmark or is included within a historic district, the provisions of §§ 1723 through 1727 shall apply to those portions of buildings in Squares 483, 484, 515, or 516 that:

1. (a) Front on K Street or 5th Street; and
2. (b) Fall within any of four (4) seventy-two-foot-square (72 ft. by 72 ft.) areas as measured from the point of tangency of the rights of way lines of K Street and 5th Street in the relevant quadrant described by the intersection of these streets.

1723.2 The area described in § 1723.1 shall hereafter be referred to as the Principal Intersection Area (PIA).

1723.3 As illustrated in the following table, each of the four corners within the PIA has four (4) thirty-six-foot by thirty-six-foot (36 ft. by 36 ft.) modules.

Square 483	Square 483		5th Street	Square 515		Square 515
	D	B		B	D
	C	A (NW)		A (NE)	C
K Street			Intersection 5th & K Streets	K Street
Square 484	C	(SW) A	5th Street	(SE) A	C	Square 516
	D	B		B	D
	Square 484			Square 516

1723.4 In the table, "K Street" defines the east and west directions; "5^th Street" defines the north and south directions. The northwest corner is Square 483; the northeast corner is Square 515; the southwest corner is Square 484; the southeast corner is Square 516.

1723.5 At each corner there are four modules labeled A, B, C and D. Each block in the chart labeled A, B, C, or D represents a thirty-six-foot by thirty-six-foot (36 ft. by 36 ft.) area within the

respective seventy-two-foot by seventy-two-foot (72 ft. by 72 ft.) PIA corner.

1723.6 The 'A' modules are the thirty-six-foot by thirty-six-foot (36 ft. by 36 ft.) modules nearest to the intersections. The 'B' modules are the thirty-six-foot by thirty-six-foot (36 ft. by 36 ft.) modules fronting on 5th Street that are between thirty-six (36) feet and seventy-two (72) feet north and south of K Street. The 'C' modules are the thirty-six-foot by thirty-six-foot (36 ft. by 36 ft.) modules fronting on K Street that are between thirty-six (36) feet and seventy-two (72) feet east and west of 5th Street. The 'D' modules are the thirty-six-foot by thirty-six-foot (36 ft. by 36 ft.) interior modules that have frontage on neither K Street nor 5th Street.

SOURCE: Final Rulemaking published at 53 DCR 7860 (September 29, 2006).