How a 800sqft custom ADU fit on a pie-shaped lot Discover how a Sunnyvale family overcame space challenges with a custom ADU by VitalizeBuild. Learn how Bay Area zoning, design expertise, and smart construction made their dream possible. For many homeowners in Sunnyvale, Los Altos, and across the Bay Area, an irregular-shaped lot is often seen as a limitation—something that makes building harder, more expensive, or even impossible. But when it comes to Accessory Dwelling Unit