Building setbacks are established by the zoning district (e.g., RDL-7,000, RDL-12,000, etc) your residence is located. You can determine what district your property is located in by looking at the zoning map (PDF). After determining the zoning district, refer to Title 18 - Zoning of the Municipal Code for setbacks (find the chapter for the specific zoning district the residence is located and setback standards listed under “Site Development Standards” section of the zoning district). The listed setbacks apply to the dwellings.
There are separate setback standards for accessory structures, such as arbors, detached garages, storage sheds, decks, etc.
PLEASE NOTE: Setbacks are based on lot lines. For corner lots, the front lot line is the shortest side of the lot adjacent to a public streets - regardless of which street the "front" door faces.