Welcome to 420 Sievers Avenue! Don't miss this rare opportunity to own a beautifully updated historic Brea home, built in 1923 and a part of the Mills Act for significant property tax savings. Stepping up to the home you are greeted by an oversized front porch complete with porch swing, this spot is perfect to unwind after a busy day and enjoy views of the front yard and neighborhood! This charming single-family residence combines vintage character with modern comforts and includes a fully equipped ADU--perfect for multigenerational living or rental income. The main home features 2 spacious bedrooms, each with walk-in closets, and a remodeled bathroom. The bedrooms share access to the remodeled bathroom which has been remodeled to keep its 1923 charm but allow for today's conveniences. The open-concept layout highlights a remodeled kitchen with granite countertops, hardwood cabinetry, and stainless steel appliances. The detached ADU offers its own front porch, a full kitchen with tile countertops and dishwasher, a full bathroom, and a bright, spacious living area with plenty of windows and a cozy eat-in nook. Additional features include a detached 2-car garage, ample driveway parking, and a convenient storage shed. Both units have been freshly painted inside, enhancing the move-in-ready appeal. Situated in a prime Brea location close to shopping, dining, and entertainment--including downtown Brea, Brea Mall, and several local golf courses. Enjoy easy access to the 57 and 91 freeways, and proximity to City Hall Park, Craig Regional Park, Fullerton College, and Cal State Fullerton. This is a unique chance to own a piece of Brea history with modern upgrades and exceptional location.