3.1 and 3.2 Residential Districts — File 23-1198

3 RESIDENCE DISTRICTS NEIGHBORHOOD RESIDENCE URBAN RESIDENCE

38 | SOMERVILLE ZONING ORDINANCE 3. Residence Districts Neighborhood Residence (NR) 3. Residence Districts Neighborhood Residence (NR) 02/06/23 2. Intent a. To implement the objectives of the comprehensive plan of the City of Somerville. b. To conserve already established areas of detached and semi-detached residential buildings. 3. Purpose a. To permit the development of one-, two-, and three-unit detached and semi-detached residential buildings on individual lots. b. To permit contextual modifications to existing detached and semi-detached residential buildings. c. To permit the adaptive reuse of certain existing nonconforming buildings for arts & creative enterprise and retail uses compatible with residential areas. d. To create dwelling unit types, sizes, and bedroom counts ideal for larger households in houses, semi- attached houses, duplexes, and triple deckers. e. To create dwelling unit types, sizes, and bedroom counts ideal for smaller households in cottages and backyard cottages. 4. Applicability a. The section is applicable to all real property within the Neighborhood Residence district as shown on the maps of the Official Zoning Atlas of the City of Somerville. 5. Development Review a. Development review is subject to the provisions of Article 15: Administration of this Ordinance. b. This Ordinance may also require Subdivision Plan Approval, Site Plan Approval, a Special Permit, or a Hardship Variance based on the nature of a development proposal. In such cases, additional development review is required in accordance with Article 15: Administration. i. The Zoning Board of Appeals is the decision making authority for all development that requires Site Plan Approval, a Special Permit, or a Hardship Variance in the Neighborhood Residence district. c. Upon verification that no additional development review is necessary, or completion of the required development review, the Building Official shall issue a Zoning Compliance Certificate to certify compliance with the provisions and procedures of this Ordinance. 6. Building Types a. One (1) principal building and one (1) accessory building are permitted on each lot. b. Unless otherwise specified, the following principal building types are permitted by right in the Neighborhood Residence district: i. Cottage ii. Detached House iii. Semi-Detached House iv. Duplex v. Detached Triple Decker c. The detached triple decker building type is permitted only on a compliant lot that is either abutting at the side or directly opposite on any thoroughfare from a lot with an existing triple decker building type. d. The following accessory building types are permitted by right in the Neighborhood Residence district: i. Backyard Cottage e. Accessory structures are regulated according to Article 10: Development Standards of this Ordinance.

39 SOMERVILLE ZONING ORDINANCE | 3. Residence Districts Neighborhood Residence (NR) 3. Residence Districts Neighborhood Residence (NR) 02/06/23 3.1.7 Cottage A small floor plate, detached, principal building type with one (1) dwelling unit. The cottage is the smallest type of detached principal building in Somerville. Two variants exist, one with a half-story under pitched roof and another with a full height second story and a shallow pitched roof or a flat roof. The following images are examples from Somerville of the cottage building type and are intended only for illustrative purposes.

40 | SOMERVILLE ZONING ORDINANCE 3. Residence Districts Neighborhood Residence (NR) 3. Residence Districts Neighborhood Residence (NR) 02/06/23 3.1.7 Cottage (continued) a. Lot Standards b. Building Placement Lot Dimensions Building Setbacks A Lot Width (min) -- A Primary Front Setback1 (min/max) 10 ft 20 ft No Driveway Access 32 ft B Secondary Front Setback1 (min/max) 10 ft 20 ft Side or Rear Driveway Access 32 ft C Side Setback (min) -- Front Driveway Access 34 ft No Driveway Access 5 ft B Lot Depth (min) 70 ft Side or Rear Driveway Access 5 ft Front Driveway Access 3 ft Lot Development Sum of Side Setbacks (min) -- C Lot Coverage (max) 60% No Driveway Access 10 ft D Green Score -- Side or Rear Driveway Access 10 ft Minimum 0.35 Front Driveway Access 12 ft Ideal 0.40 D Rear Setback (min) 20 ft E Building Separation (min) 10 ft Parking Setbacks F Primary Front Setback (min) 20 ft G Secondary Front Setback (min) 10 ft 1 See §3.1.13.a Contextual Front Setbacks

41 SOMERVILLE ZONING ORDINANCE | 3. Residence Districts Neighborhood Residence (NR) 3. Residence Districts Neighborhood Residence (NR) 02/06/23 3.1.7 Cottage (continued) c. Massing & Height d. Uses & Features Main Mass Facade Composition Facade Build Out (min) 60% A Ground Story Fenestration (min/max) 15% 50% A Width (min/max) 22 ft 26 ft B Upper Story Fenestration (min/max) 15% 50% B Depth (min/max) 24 ft 32 ft Ground story Elevation (min) 2 ft Use & Occupancy C Story Height (min/max) 10 ft 12 ft Dwelling Units per Lot (max) 1 D Number of Stories (max) 2 Dwelling Units (max) 1 Roof Type Flat, Gable, Mansard Outdoor Amenity Space (min) 1/ DU

42 | SOMERVILLE ZONING ORDINANCE 3. Residence Districts Neighborhood Residence (NR) 3. Residence Districts Neighborhood Residence (NR) 02/06/23 3.1.7 Cottage (continued) e. Reserved.

43 SOMERVILLE ZONING ORDINANCE | 3. Residence Districts Neighborhood Residence (NR) 3. Residence Districts Neighborhood Residence (NR) 02/06/23 3.1.8 Detached House A moderate floor plate, detached, principal building type with one (1) to three (3) vertically stacked dwelling units, where each unit typically has its own front door. The house is the most prevalent building type in Somerville. When the second floor is split between two dwelling units, this type is referred to as a “Philly Style”. The following images are examples from Somerville of the house building type and are intended only for illustrative purposes.

44 | SOMERVILLE ZONING ORDINANCE 3. Residence Districts Neighborhood Residence (NR) 3. Residence Districts Neighborhood Residence (NR) 02/06/23 3.1.8 Detached House (continued) a. Lot Standards b. Building Placement Lot Dimensions Building Setbacks A Lot Width (min) -- A Primary Front Setback1 (min/max) 10 ft 20 ft No Driveway Access 32 ft B Secondary Front Setback1 (min/max) 10 ft 20 ft Side or Rear Driveway Access 32 ft C Side Setback (min) -- Front Driveway Access 34 ft No Driveway Access 5 ft B Lot Depth (min) 80 ft Side or Rear Driveway Access 5 ft Front Driveway Access 3 ft Lot Development Sum of Side Setbacks (min) -- C Lot Coverage (max) 60% No Driveway Access 10 ft D Green Score -- Side or Rear Driveway Access 10 ft Minimum 0.35 Front Driveway Access 12 ft Ideal 0.40 D Rear Setback (min) 20 ft E Building Separation (min) 10 ft Parking Setbacks F Primary Front Setback (min) 20 ft G Secondary Front Setback (min) 10 ft 1 See §3.1.13.a Contextual Front Setbacks

45 SOMERVILLE ZONING ORDINANCE | 3. Residence Districts Neighborhood Residence (NR) 3. Residence Districts Neighborhood Residence (NR) 02/06/23 3.1.8 Detached House (continued) c. Massing & Height d. Uses & Features Main Mass Facade Composition Facade Build Out (min) 50% A Ground Story Fenestration (min/max) 15% 50% A Width (min/max) 22 ft 28 ft B Upper Story Fenestration (min/max) 15% 50% B Depth (min/max) 28 ft 48 ft Ground story Elevation (min) 2 ft Use & Occupancy C Story Height (min/max) 10 ft 12 ft Dwelling Units per Lot (max) 3 D Number of Stories (max) 2.5 Dwelling Units (max) 3 Roof Type Flat, Gable, Gambrel, Hip, or Mansard Outdoor Amenity Space (min) 1/ DU

46 | SOMERVILLE ZONING ORDINANCE 3. Residence Districts Neighborhood Residence (NR) 3. Residence Districts Neighborhood Residence (NR) 02/06/23 3.1.8 Detached House (continued) e. Housing i. Multiple dwelling units within a detached house building type must be, generally, stacked one over the other. Common examples are shown in Figure 3.1.8. Dwelling units that are side-by-side or front- to-back in orientation are not permitted. f. Development Benefits i. Development is subject to the provisions of Article 12: Development Benefits of this Ordinance. Where the provisions of this section conflict with those of Article 12, the provisions of Article 12 apply. ii. Development of a detached house principal building must provide affordable dwelling units as specified on Table 3.1.8. iii. Required ADUs must be priced as a Tier 3: Moderate Income Rental ADU or a Tier 3: Middle Income Ownership ADU. See Section 12.1 Affordable Housing for more information. Figure 3.1.8  DU Orientation Examples 2 1 2 1 3 2 3 1 Table 3.1.8  Required ADUs Dwelling Units per Lot Required ADUs 0 to 2 units None 3 units 1 unit "Philly Style"

47 SOMERVILLE ZONING ORDINANCE | 3. Residence Districts Neighborhood Residence (NR) 3. Residence Districts Neighborhood Residence (NR) 02/06/23 3.1.9 Semi-Detached House A moderate floor plate, semi-detached, principal building type with one (1) to three (3) vertically stacked dwelling units. A semi-detached house must be attached on one side to another semi-detached house by a party wall. The following images are examples from Somerville of the semi-detached house building type and are intended only for illustrative purposes.

48 | SOMERVILLE ZONING ORDINANCE 3. Residence Districts Neighborhood Residence (NR) 3. Residence Districts Neighborhood Residence (NR) 02/06/23 3.1.9 Semi-Detached House (continued) a. Lot Standards b. Building Placement Lot Dimensions Building Setbacks A Lot Width (min) -- A Primary Front Setback1 (min/max) 10 ft 20 ft No Driveway Access 27 ft B Secondary Front Setback1 (min/max) 10 ft 20 ft Side or Rear Driveway Access 27 ft C Side Setback (min) -- Front Driveway Access 30 ft No Driveway Access 5 ft B Lot Depth (min) 80 ft Side or Rear Driveway Access 5 ft Front Driveway Access 8 ft Lot Development Party Line Setback (min) 0 ft C Lot Coverage (max) 60% Sum of Side Setbacks (min) -- D Green Score -- No Driveway Access 5 ft Minimum 0.35 Side or Rear Driveway Access 5 ft Ideal 0.40 Front Driveway Access 8 ft D Rear Setback (min) 20 ft E Building Separation (min) 10 ft Parking Setbacks F Primary Front Setback (min) 20 ft G Secondary Front Setback (min) 10 ft 1 See §3.1.13.a Contextual Front Setbacks

49 SOMERVILLE ZONING ORDINANCE | 3. Residence Districts Neighborhood Residence (NR) 3. Residence Districts Neighborhood Residence (NR) 02/06/23 3.1.9 Semi-Detached House (continued) c. Massing & Height d. Uses & Features Main Massing Facade Composition Facade Build Out (min) 50% A Ground Story Fenestration (min/max) 15% 50% A Width (min/max) 22 ft 28 ft B Upper Story Fenestration (min/max) 15% 50% B Depth (min/max) 28 ft 48 ft Ground story Elevation (min) 2 ft Use & Occupancy C Story Height (min/max) 10 ft 12 ft Dwelling Units per Lot (max) 3 D Number of Stories (max) 2.5 Dwelling Units (max) 3 Roof Type Flat, Gable, Hip, Mansard Outdoor Amenity Space (min) 1/ DU

50 | SOMERVILLE ZONING ORDINANCE 3. Residence Districts Neighborhood Residence (NR) 3. Residence Districts Neighborhood Residence (NR) 02/06/23 3.1.9 Semi-Detached House (continued) e. Housing i. Multiple dwelling units within a semi-detached house building type must be, generally, stacked one over the other. Common examples are shown in Figure 3.1.9. Dwelling units that are side-by-side or front-to-back in orientation are not permitted. f. Development Benefits i. Development is subject to the provisions of Article 12: Development Benefits of this Ordinance. Where the provisions of this section conflict with those of Article 12, the provisions of Article 12 apply. ii. Development of a detached house principal building must provide affordable dwelling units as specified on Table 3.1.9. iii. Required ADUs must be priced as a Tier 3 ADU: Moderate Income Rental ADU or a Tier 3: Middle Income Ownership ADU. See Section 12.1 Affordable Housing for more information. Table 3.1.9  Required ADUs Dwelling Units per Lot Required ADUs 0 to 2 units None 3 units 1 unit Figure 3.1.9  DU Orientation Examples

51 SOMERVILLE ZONING ORDINANCE | 3. Residence Districts Neighborhood Residence (NR) 3. Residence Districts Neighborhood Residence (NR) 02/06/23 3.1.10 Duplex A moderate floor plate, detached, principal building type with two (2) side-by-side dwelling units. When occupying a corner lot, the duplex my have dwelling units attached back to side so that one (1) dwelling unit is oriented toward each frontage. The following images are primarily examples from Somerville of the duplex building type and are intended only for illustrative purposes.

52 | SOMERVILLE ZONING ORDINANCE 3. Residence Districts Neighborhood Residence (NR) 3. Residence Districts Neighborhood Residence (NR) 02/06/23 3.1.10 Duplex (continued) a. Lot Standards b. Building Placement Lot Dimensions Building Setbacks A Lot Width (min) -- A Primary Front Setback1 (min/max) 10 ft 20 ft No Driveway Access 50 ft B Secondary Front Setback1 (min/max) 10 ft 20 ft Side or Rear Driveway Access 50 ft C Side Setback (min) -- Front Driveway Access 52 ft No Driveway Access 5 ft B Lot Depth (min) 70 ft Side or Rear Driveway Access 5 ft Front Driveway Access 3 ft Lot Development Sum of Side Setbacks (min) -- C Lot Coverage (max) 60% No Driveway Access 10 ft Green Score -- Side or Rear Driveway Access 10 ft Minimum 0.35 Front Driveway Access 12 ft Ideal 0.40 D Rear Setback (min) 20 ft E Building Separation (min) 10 ft Parking Setbacks F Primary Front Setback (min) 20 ft G Secondary Front Setback (min) 10 ft 1 See §3.1.13.a Contextual Front Setbacks

53 SOMERVILLE ZONING ORDINANCE | 3. Residence Districts Neighborhood Residence (NR) 3. Residence Districts Neighborhood Residence (NR) 02/06/23 3.1.10 Duplex (continued) c. Massing & Height d. Uses & Features Main Massing Facade Composition Facade Build Out (min) 50% A Ground Story Fenestration (min/max) 15% 50% A Width (min/max) 40 ft 56 ft B Upper Story Fenestration (min/max) 15% 50% B Depth (min/max) 30 ft 52 ft Ground story Elevation (min) 2 ft Use & Occupancy C Story Height (min/max) 10 ft 12 ft Dwelling Units per Lot (max) 2 D Number of Stories (max) 2.5 stories Dwelling Units (max) 2 Roof Type Flat, Gable, Hip, Mansard Outdoor Amenity Space (min) 1/ DU

54 | SOMERVILLE ZONING ORDINANCE 3. Residence Districts Neighborhood Residence (NR) 3. Residence Districts Neighborhood Residence (NR) 02/06/23 3.1.10 Duplex (continued) e. Housing i. The two (2) dwelling units within a duplex building type must be side-by-side and both must be oriented toward the front lot line. On corner lots, one dwelling unit may be oriented toward each front lot line resulting in units that are back-to-side in orientation. See Figure 3.1.10. Dwelling units that are stacked one over the other or attached front to back in orientation are not permitted. Figure 3.1.10  DU Orientation Examples

55 SOMERVILLE ZONING ORDINANCE | 3. Residence Districts Neighborhood Residence (NR) 3. Residence Districts Neighborhood Residence (NR) 02/06/23 3.1.11 Detached Triple Decker A moderate floor plate, detached, principal building type with two (2) to three (3) vertically stacked dwelling units. The following images are examples from Somerville of the detached triple decker building type and are intended only for illustrative purposes.

56 | SOMERVILLE ZONING ORDINANCE 3. Residence Districts Neighborhood Residence (NR) 3. Residence Districts Neighborhood Residence (NR) 02/06/23 3.1.11 Detached Triple Decker (continued) a. Lot Standards b. Building Placement Lot Dimensions Building Setbacks A Lot Width (min) -- A Primary Front Setback1 (min/max) 10 ft 20 ft No Driveway Access 34 ft B Secondary Front Setback1 (min/max) 10 ft 20 ft Side or Rear Driveway Access 34 ft C Side Setback (min) -- Front Driveway Access 36 ft No Driveway Access 5 ft B Lot Depth (min) 80 ft Side or Rear Driveway Access 5 ft Front Driveway Access 3 ft Lot Development Sum of Side Setbacks (min) -- C Lot Coverage (max) 60% No Driveway Access 10 ft D Green Score -- Side or Rear Driveway Access 10 ft Minimum 0.35 Front Driveway Access 12 ft Ideal 0.40 D Rear Setback (min) 20 ft E Building Separation (min) 10 ft Parking Setbacks F Primary Front Setback (min) 20 ft G Secondary Front Setback (min) 10 ft 1 See §3.1.13.a Contextual Front Setbacks

57 SOMERVILLE ZONING ORDINANCE | 3. Residence Districts Neighborhood Residence (NR) 3. Residence Districts Neighborhood Residence (NR) 02/06/23 3.1.11 Detached Triple Decker (continued) c. Massing & Height d. Uses & Features Main Massing Facade Composition Facade Build Out (min) 60% A Ground Story Fenestration (min/max) 15% 50% A Width (min/max) 24 ft 30 ft B Upper Story Fenestration (min/max) 15% 50% B Depth (min/max) 36 ft 50 ft Ground story Elevation (min) 2 ft Use & Occupancy C Story Height (min/max) 10 ft 12 ft Dwelling Units per Lot (max) 3 D Number of Stories (max) 3 stories Dwelling Units (max) 3 Roof Type Flat Outdoor Amenity Space (min) 1/ DU

58 | SOMERVILLE ZONING ORDINANCE 3. Residence Districts Neighborhood Residence (NR) 3. Residence Districts Neighborhood Residence (NR) 02/06/23 3.1.11 Detached Triple Decker (continued) e. Housing i. Multiple dwelling units within a detached triple decker building type must be, generally, stacked one over the other. Common examples are shown in Figure 3.1.11. Dwelling units that are side-by-side or front-to-back in orientation are not permitted. f. Development Benefits i. Development is subject to the provisions of Article 12: Development Benefits of this Ordinance. Where the provisions of this section conflict with those of Article 12, the provisions of Article 12 apply. ii. Development of a detached triple decker must provide affordable dwelling units as specified on Table 3.1.11. iii. Required ADUs must be priced as a Tier 3 ADU: Moderate Income Rental ADU or a Tier 3: Middle Income Ownership ADU. See Section 12.1 Affordable Housing for more information. Table 3.1.11  Required ADUs Dwelling Units per Lot Required ADUs 0 to 2 units None 3 units 1 unit Figure 3.1.11  DU Orientation Examples 2 1 3 2 3 1

59 SOMERVILLE ZONING ORDINANCE | 3. Residence Districts Neighborhood Residence (NR) 3. Residence Districts Neighborhood Residence (NR) 02/06/23 3.1.12 Backyard Cottage A small floor plate, detached, accessory building type typically providing space for one (1) small dwelling unit, a home occupation, a playhouse for children, or vehicular parking on the same lot as a principal building type. The following images are examples of the backyard cottage accessory building type and are intended only for illustrative purposes.

60 | SOMERVILLE ZONING ORDINANCE 3. Residence Districts Neighborhood Residence (NR) 3. Residence Districts Neighborhood Residence (NR) 02/06/23 3.1.12 Backyard Cottage (continued) a. Lot Standards b. Building Placement Lot Dimensions Building Setbacks A Lot Width (min) -- A Primary Front Setback (min) 60 ft No Driveway Access 32 ft B Secondary Front Setback (min) 10 ft Side or Rear Driveway Access 32 ft C Side Setback (min) 3 ft Front Driveway Access 34 ft E Rear Setback (min) 3 ft B Lot Depth (min) 80 ft Alley 3 or 20 ft No Alley 3 ft Lot Development E Building Separation (min) 10 ft C Lot Coverage (max) per Principal Building D Green Score (min) per Principal Building

61 SOMERVILLE ZONING ORDINANCE | 3. Residence Districts Neighborhood Residence (NR) 3. Residence Districts Neighborhood Residence (NR) 02/06/23 3.1.12 Backyard Cottage (continued) c. Massing & Height d. Uses & Features Main Massing Facade Composition A Width (max) 24 ft A Ground Story Fenestration (min/max) -- B Depth (max) 32 ft Residential Use 15% 50% C Floor plate (max) 576 sf Vehicular Parking 0% 50% D Story Height (max) 12 ft B Upper Story Fenestration (min/max) 15% 50% E Number of Stories (max) 1.5 stories Roof Type Flat, Gable Use & Occupancy Dwelling Units per Lot (max) per Principal Building Dwelling Units (max) 1

62 | SOMERVILLE ZONING ORDINANCE 3. Residence Districts Neighborhood Residence (NR) 3. Residence Districts Neighborhood Residence (NR) 02/06/23 3.1.12 Backyard Cottage (continued) e. Housing i. Reserved f. Development Benefits i. Development is subject to the provisions of Article 12: Development Benefits of this Ordinance. Where the provisions of this section conflict with those of Article 12, the provisions of Article 12 apply. ii. Development of a Backyard Cottage accessory building may or may not require a dwelling unit to be an affordable dwelling unit based on the combined number dwelling units provided in the principal building and the backyard cottage. See the standards for each principal building type for additional information. iii. Required ADUs must be priced as a Tier 3 ADU: Moderate Income Rental ADU or a Tier 3: Middle Income Ownership ADU. See Section 12.1 Affordable Housing for more information. g. Design Standards i. A three (3) foot wide paved walkway capable of allowing an ambulance cot to be wheeled to and from the Backyard Cottage is required. ii. Utility services for the Backyard Cottage must be buried underground. iii. By order of the Fire Prevention Bureau, Backyard Cottages occupied by any permitted Residential principal use must have an automatic sprinkler system unless they are on a corner lot, a lot with a driveway leading to the Backyard Cottage, or a lot abutting an alley. Figure 3.1.8  DU Orientation Examples

3. Residence Districts Urban Residence (UR) 02/06/23 79 SOMERVILLE ZONING ORDINANCE | 3. Residence Districts Urban Residence (UR) 3.2.7 Semi-Detached Triple Decker A moderate floor plate, semi-detached, principal building type with three vertically stacked dwelling units. A semi- detached triple decker must be attached on one side to another semi-detached triple decker by a party wall. The following images are examples from Somerville of the semi-detached triple decker building type and are intended only for illustrative purposes.

3. Residence Districts Urban Residence (UR) 02/06/23 80 | SOMERVILLE ZONING ORDINANCE 3. Residence Districts Urban Residence (UR) 3.2.7. Semi-Detached Triple Decker (continued) a. Lot Standards b. Building Placement Lot Dimensions Building Setbacks A Lot Width (min) -- A Primary Front Setback1 (min/max) 10 ft 20 ft No Driveway Access 29 ft B Secondary Front Setback1 (min/max) 10 ft 20 ft Side or Rear Driveway Access 29 ft C Side Setback (min) Front Driveway Access 32 ft Party Lot Line 0 ft B Lot Depth (min) 80 ft Side Lot Line 5 ft D Rear Setback (min) 20 ft Lot Development C Lot Coverage (max) 65% Parking Setbacks D Green Score -- E Primary Front Setback (min) 20 ft Minimum 0.35 F Secondary Front Setback (min) 10 ft Ideal 0.40 1 See §3.2.13.a Contextual Front Setbacks

3. Residence Districts Urban Residence (UR) 02/06/23 81 SOMERVILLE ZONING ORDINANCE | 3. Residence Districts Urban Residence (UR) 3.2.7. Semi-Detached Triple Decker (continued) c. Massing & Height d. Uses & Features Main Mass Facade Composition Facade Build Out (min) 60% A Ground Story Fenestration (min/max) 15% 50% A Width (min/max) 24 ft 30 ft B Upper Story Fenestration (min/max) 15% 50% B Depth (min/max) 36 ft 50 ft Ground story Elevation (min) 2 ft Use & Occupancy C Story Height (min/max) 10 ft 12 ft Dwelling Units (max) 3 D Number of Stories (max) 3 stories Outdoor Amenity Space (min) 1/ DU Roof Type Flat

3. Residence Districts Urban Residence (UR) 02/06/23 82 | SOMERVILLE ZONING ORDINANCE 3. Residence Districts Urban Residence (UR) 3.2.7. Semi-Detached Triple Decker (continued) e. Housing i. Multiple dwelling units within a semi-detached triple decker must be, generally, stacked one over the other. Common examples are shown in Figure 3.2.7. Dwelling units that are side-by-side or front- to-back in orientation are not permitted. f. Development Benefits i. Development is subject to the provisions of Article 12: Development Benefits of this Ordinance. Where the provisions of this section conflict with those of Article 12, the provisions of Article 12 apply. ii. Development of a semi-detached triple decker must provide affordable dwelling units as specified on Table 3.2.7. iii. Required ADUs must be priced as a Tier 3 ADU: Moderate Income Rental ADU or a Tier 3: Middle Income Ownership ADU. See Section 12.1 Affordable Housing for more information. Table 3.2.7  Required ADUs Dwelling Units per Lot Required ADUs 0 to 2 units None 3 units 1 unit Figure 3.2.7  DU Orientation Examples