Known as the Roundhouse Retreat, this one-of-a-kind Nevada City estate offers two homes on one 20.73-acre lot. Panoramic Sierra Nevada views, single-level living, and a close-in location just 2.5 miles from downtown add to the appeal of this architectural gem. Its distinctive round rooms were intentionally designed to honor the cycles of the moon, creating a home with a natural sense of flow and connection to its surroundings. The main house features: 4+ bedrooms/3 full baths, Loewen windows, skylights, radiant floor heat, A/C, an attached two-bedroom apartment, an oversized loft, a serene sleeping porch, and a saltwater pool + hot tub. The ADU offers: two bedrooms, a loft, skylights, and the same sweeping Sierra views. Additional features include two solar arrays, three water sources, and an approximately 1,100-square-foot carport with storage. The sale also includes a 1.2-acre buffer parcel on Cement Hill Road. A beloved gathering place for family, friends, and community, the Roundhouse Retreat offers privacy and space for multigenerational living, a personal retreat, or a variety of potential rental income opportunities.