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names (or abbreviations) for the model provisions' descriptions of zoning districts. Accessory dwelling units are allowed in all zoning districts that allow residential use, subject to the requirements of this ordinance. Optional Provision: Accessory Dwelling Units on Town House Lots Definition: "Town house" is a single-family dwelling unit constructed in a group of three or more attached units, with each unit extending from foundation to roof and having a yard or public way on not fewer than two sides. A town house structure may be constructed or remodeled as a group of two or more attached two-family dwellings under the following conditions: (1) one of the two-family dwelling units shall conform to the requirements of the accessory dwelling unit standards and (2) each two-family dwelling within the town house structure shall meet the definition of an attached house, including that it be located on its own lot. D. Number of ADUs Allowed Per Lot in Single -Family Zones In California (as of2020) a single-family lot can have both an ADU and a junior accessory dwelling unit that is no larger than 500 square feet and is part of the primary residence. In 2019, Seattle authorized that one detached ADU and one internal ADU can be located per single-family lot. If green building or affordability requirements are met, a second detached unit could be allowed. In 2020, Portland, Oregon, decided to allow two ADUs in any configuration on each single-family zoned lot as part of a broad reform of residential zoning. Since 2016, the Canadian city of Vancouver, British Columbia, has allowed a "secondary suite" (internal ADU) and a "laneway home" (detached ADU with alley access) on single-family corner lots, double -fronted lots and lots with alleys. There are many ways to accommodate more than one ADU while being sensitive to concerns about neighborhood appearance. For example, two internal ADUs can be accommodated by remodeling a large home without increasing height or bulk. An internal unit can be allowed along with an ADU over an attached garage without increasing the area of the lot occupied by structures. Discussions about allowing more than one ADU per lot in single-family zones may result in a challenging but beneficial community discussion about the purposes of single-family zoning. Minneapolis, Minnesota; Portland, Oregon; and the State of Oregon have reformed their residential zoning. The Model State ADU Act allows two ADUs per lot without specifying their form, leaving that to local government or homeowner discretion. This provision is written to allow for both concurrent and prior construction ofADUs. (The issue of the timing ofADU construction relative to construction of the primary dwelling is discussed in the alternate definitions ofADUs in I.C.1.) Some ordinances, for example Seattle's, have made the creation of additional ADUs conditional on achieving other community goals, such as affordability, accessibility and green building performance standards. This follows the precedents created by inclusionary zoning ordinances that allow for additional units in multifamily developments if the rents for those units meet an affordability standard for a specified period. It is too soon to know whether these incentives will be effective in spurring the creation of additional ADUs. Provisions allowing these "Bonus ADUs" (BADUs) are presented here as options. (1) Any lot with, or zoned for, a principal single-family dwelling unit may have up to two ADUs. -+ 34 1 HARP - Accessory Dwelling Units: Model State Act and Local Ordinance