The SEFC-1 zone provides for high-density mixed-use development with ground floor retail, and review of the relationship of new buildings to the M Street, S.E. corridor and the adjacent Washington Navy Yard.

Development Standards
Floor Area Ratio (max.)1 Height (ft.)2, 3 Penthouse Height (ft.)/Stories Lot Occupancy
Rear Yard (ft.) Side Yard (ft.) Green Area Ratio Zoning Regulation Reference
SEFC-1 6.0 110 20 /
1 story plus mezzanine
75% (residential) 2.5 in. per 1 ft. of height or a minimum of 12 ft. No side yard is required; however, any side yard provided shall be 5 ft. minimum. 0.20 Subtitle K Chapter 2
3.0 (non-residential) Second additional story for mechanical space 100% (non-residential)

Use Permissions Courts Parking and Loading Front Setback Inclusionary Zoning
Subtitle K § 237 Subtitle K § 208 Subtitle C, Chapter 7/8 Subtitle K § 205 Subtitle C, Chapter 10

1 Combined lot development of two or more lots within the SEFC-1 zone, whether contiguous or non-contiguous, is permitted for the purpose of allocating density for residential and non-residential uses, regardless of any other limitation on floor area by uses as established in this chapter provided that: (a) The aggregate residential and non-residential floor area shall not exceed the matter-of-right maximum height or density of the SEFC-1 zone; (b) A site that is permitted a height of 130 ft. is permitted a maximum non-residential density of 6.5 FAR through combined lot development; and (c) Ground floor area required for ground-floor street-oriented preferred uses  may not be transferred to any other lot through combined lot development.
2 A site that has frontage on any portion of New Jersey Avenue, S.E., that is south of and within 322 ft. of M Street, S.E., is permitted a maximum height of 130 ft.
3 Sites fronting on M Street, S.E., east of 4th Street, S.E., are restricted to a height of 90 ft. A building height of 110 ft. maximum is permitted if reviewed and approved by the Zoning Commission pursuant to the procedures of Subtitle K § 211. For the purposes of this review, the Zoning Commission shall consider the relationship of the new building to the Navy Yard to the east and may require graduated height and/or design features because of the building's proximity to the Navy Yard.