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No additional setback is required for an ADU if constructed in the same footprint and with the same dimensions (including height) as the existing structure. An expansion of no more than 150 square feet beyond the existing dimensions can be allowed for ingress and egress purposes only. 

ADUs may either be created through conversion of non-habitable space (e.g. basement, laundry room, or storage areas) within the multi-family structure or by conversion of existing accessory structures or new construction of detached structures. No JADUs are permitted.  Within Existing Main Structure: At least one (1) ADU is allowed up to a maximum of twenty-five...

Properties with a Single-family residence may have the following:  One detached ADU (new construction or conversion). One attached ADU (new construction or conversion). One JADU (conversion). A combination of one detached or attached ADU, one JADU, and one conversion ADU.

When a garage, carport, or covered parking structure is demolished in conjunction with the construction of an ADU or converted to an ADU, replacement off-street parking is not required. 

Regardless of lot coverage, floor area ratio, natural state, setback, and other standards you are allowed an ADU of up to 800 square feet provided it has the minimum 4-foot rear and side yard setback and complies with the maximum height limits. 

If you are adding square footage onto an existing structure to create an attached ADU, the square footage of the ADU cannot exceed 50% of the square footage of the main residence or 1,000 square feet, whichever is less; however, an ADU of up to 800 square feet is always allowed.   Examples:   2,200 square-foot main...

There is a minimum size of 150 square feet for ADUs and JADUs. ADUs must include kitchen, sleeping, and bathroom facilities; a JADU may share eating and bathroom facilities with the primary dwelling provided there is an internal connection. 

Fire sprinklers cannot be required in an ADU if sprinklers are not required for the primary residence. Construction of an ADU does cannot trigger a requirement that fire sprinklers be installed in the proposed or existing primary dwelling. 

The ADU rules apply to any property that is in a zoning district that allows residential use and has either existing or proposed dwelling units. For example, the Commercial/Office zoning district (C/O) is a commercial district that allows multifamily use under certain circumstances so the rules would apply to an existing or proposed residential use...