The purpose of the RF-1 zone is to provide for areas predominantly developed with row houses on small lots within which no more than two (2) dwelling units are permitted.

In the RF-1 Zone, 2 dwelling units may be located within the principal structure or 1 each in the principal structure and an accessory structure.

A building or structure existing before May 12, 1958 in the RF-1 zone may be used for more than 2 dwelling units (Subtitle U, Chapter 3).

Accessory apartments are not permitted in a dwelling unit in RF-1.  (Please note accessory apartments are reserved for R zones only, except R-19 and R-20.)

rf-1
Development Standards
Height (ft.)1, 2 Stories Lot Occupancy3,4 Front Setback Rear Yard (ft.) Side Yard (ft.) Zoning Regulation Reference
RF-1 60
for a place of worship
3 60%
(Detached dwellings; Semi-detached dwellings; Row dwellings and flats; Places of worship)
A front setback shall be provided that is within the range of existing front setbacks of all structures on the same side of the street in the block where the building is proposed. 20 5,6,7 Subtitle E, § 207 Subtitle E, Chapter 3
35
for all other structures
40%
for all other structures

Use Permissions Courts Pervious Surfaces Parking Inclusionary Zoning
Subtitle U, Chapter 3 Subtitle E § 203 Subtitle E § 204 Subtitle C, Chapter 7 Subtitle C, Chapter 10

A building or other structure may be erected to a height not exceeding 90 ft.; provided that the building or structure shall be removed from all lot lines of its lot for a distance equal to the height of the building or structure above the natural grade.
2 Institutional buildings or structures may be erected to a height not exceeding 90 ft., provided that the building or structure shall be removed from all lot lines of its lot a distance of not less than 1 ft. for each foot of height in excess of that authorized in the zone in which it is located.
3Conversion of a building or structure to an apartment house: Greater of 60% or the lot occupancy as of the date of conversion. (Subtitle E, § 304)
4An apartment house that existed prior to 1958 and has been in continuous use as an apartment house: 60% maximum lot occupancy (Subtitle E, § 304)
5Notwithstanding §§ 205.1 through 205.3, a rear wall of a row or semi-detached building shall not be constructed to extend farther than ten feet (10 ft.) beyond the farthest rear wall of any adjoining principal residential building on any adjacent property. (Subtitle E, § 205.5)
6A rear wall of a row or semi-detached building may be constructed to extend farther than ten feet (10 ft.) beyond the farthest rear wall of any principal residential building on any adjacent property if approved as a special exception pursuant to Subtitle X, Chapter 9, and subject to Subtitle E § 5201 if applicable. (Subtitle E, § 205.5)