210.1 Transition setbacks apply along any and all lot lines of a lot when the lot or portion of the lot directly abuts a residential zone, a lot developed with a residential use, or an alley that abuts a residential zone, unless the PDR-zoned lot is only used for residential purposes. A residential zone is as defined in Subtitle A § 101.9.

210.2 The following required setbacks shall be provided on a lot subject to the following conditions:

1. (a) A twenty-five foot (25 ft.) setback shall be provided from each lot line that is directly abutting a lot in a residential zone or developed with a residential use;
2. (b) A twenty-five foot (25 ft.) setback shall be provided from each lot line that is abutting an alley that serves as the zone boundary line between a PDR zone and a residential zone. The depth of setback shall be measured from property line of the PDR-zoned lot; and
3. (c) A fifteen-foot (15 ft.) setback shall be provided from each lot line, except a front lot line, that is abutting a street less than seventy feet (70 ft.) in right-of-way width that serves as the zone boundary line between a PDR zone and a residential zone.

210.3 Any setback required by this section shall be located on the PDR-zoned lot and shall be extended as a vertical plane, parallel to the PDR-zoned lot line.

210.4 Any setback area required by this section shall not be used for storage, parking, loading, or accessory uses.

210.5 Any setback area required by this section shall be landscaped with evergreen trees subject to the following conditions:

1. (a) The trees shall be maintained in a healthy growing condition;
2. (b) The trees shall be a minimum of eight feet (8 ft.) high when planted; and
3. (c) Planting locations and soil preparation techniques shall be shown on a landscape plan submitted with the building permit application to the Department of Buildings for review and approval according to standards maintained by the Department of Energy and Environment, which may require replacement of heavy or compacted soils with top and drainage

mechanisms as necessary.

210.6 A form of screening shall be erected between the residential and PDR lots, and shall be located along the required setback identified in Subtitle J § 210.2(a). The screening shall be either:

(a) A solid wood or board-on-board fence, no less than eight feet (8 ft.) and no more than ten feet (10 ft.) in height; or

(b) A brick or stone wall, no less than eight feet (8 ft.) and no more than ten feet (10 ft.) in height.

210.7 A transition setback may be inclusive of a required rear yard provided all conditions of each section are met.

SOURCE: Final Rulemaking published at 63 DCR 2447, 3163 (March 4, 2016 – Part 2); as amended by Final Rulemaking published at 70 DCR 011297 (August 25, 2023).