A distinctive 1955 Atomic Ranch with a remarkable Palm Springs history, home to celebrated photographer Paul Pospesil from 1955 to 1999 is now on offer. Set in the historic Mesa neighborhood, the property has undergone substantial City-permitted renovations and additions while preserving its butterfly roofline, vaulted ceilings, walls of glass and stone fireplace. The expanded main residence offers four ensuite bedrooms, including a newly added 224 SF suite, plus a powder room. A newly constructed, detached 676 SF ADU provides a fifth bedroom and full bath. Updated HVAC systems add modern comfort. Lush landscaping surrounds a generous pool with tanning shelf and water features, framed by dramatic mountain views and a lookout for the area’s bighorn sheep. An extraordinary approximately 1,500 SF finished underground vintage fall-out shelter, formerly Pospesil’s darkroom, offers possibilities for wine storage, collections or other uses and is excluded from living area. Combining architectural heritage, privacy and modern amenities, this turnkey property is ideal as a full-time residence or potential short-term rental.