D.C. Mun. Regs. tit. 11, r. 11-1723
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:
The area described in § 1723.1 shall hereafter be referred to as the Principal Intersection Area (PIA).
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 | |||||
In the table, "K Street" defines the east and west directions; "5th 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.
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.
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.
D.C. Mun. Regs. tit. 11, r. 11-1723