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Exhibit B 9.2751 Special Development Standards for Table 9.2750. (17) Secondary Dwellings in R-1. (a) General Standards for Attached Secondary Dwellings. Except as provided in subsection (c) below, secondary dwellings that are within the same building as the primary dwelling shall comply with all of the following: 2. Building Size. The total building square footage of a secondary dwelling shall not exceed 10 percent of the total lot area or 800 square feet, whichever is smaller. Total building square footage is measured at the exterior perimeter walls and is defined as all square footage inside of the dwelling, including, but not limited to hallways, entries, closets, utility rooms, stairways and bathrooms. (b) General Standards for Detached Secondary Dwellings. In addition to the standards in subsection (a) of this section, detached secondary dwellings shall comply with the following, except as provided in subsection (c) below: 1. Building Size. Up to 300 square feet of un -heated garage or storage space attached to the secondary dwelling unit is allowed and is not counted in the allowable total building square footage. (c) Area -Specific Secondary Dwelling Standards. The following standards apply to all new attached or detached secondary dwellings in the R-1 zone within the city -recognized boundaries of Amazon Neighbors, Fairmount Neighbors and South University Neighborhood Association: 5. Building Size. For lots at least 7,500 square feet and less than 9, 000 square feet in area, the secondary dwelling shall not exceed 600 square feet of total building square footage. For lots at least 9, 000 square feet in area, the secondary dwelling shall not exceed 800 square feet of total building square footage. Total building square footage is defined as all square footage inside of the dwelling, including, but not limited to hallways, entries, closets, utility rooms, stairways and bathrooms. Findings: Building size is related to design as it affects the layout and plan (the "scheme' for the construction") of the building. Regarding EC 9.2751(17)(a)2. for attached and detached accessory dwellings (except within the university area neighborhoods), limiting building square footage to 10 percent of the total lot area or 800 square feet, whichever is smaller, is reasonable because accessory dwellings, by definition (ORS 197.312(5)(a)) must be "used in connection with" or "accessory to" the main dwelling. While not a sufficient factor on its own, the size differential contributes to the accessory relationship between the two dwellings, consistent with the statutory definition. Limiting the accessory dwelling size based on the lot size is also reasonable, because development on smaller lots can have a greater impact on overcrowding and neighborhood livability. 14