On a quiet cul-de-sac in the Altadena foothills and first time on the market, this one acre single level mid century estate designed and built by a renowned audiophile inventor, and is the laboratory of the (Don) Leslie speaker. Upon arrival, the entry posts welcomes you and leads to a motor court and a 5 bedroom, 5 bath home with a studio (possible ADU?) and workshop (totaling an additional 760 sf), dressing rooms, north/south tennis court, pool, and a 3-car garage. The interior offers spacious living and family rooms, built-in bar, dining room, gourmet kitchen with island, and a home office/bedroom perfect for working from home. Relax and entertain in paradise with a resort-style lap pool, outdoor patio and terrace, lots of open yard space ready for your imagination. Other highlights include a 400 amp service, a custom engineered sprinkler system, an intercom system, and the big highlight is a fully functional pipe organ system with a literal wall of sound. A convenient 3-car garage with motor court offers ample parking for guests. The vacant lot next door is also for sale at MLS # P1-11196 and offers a great opportunity to expand the current home or build a second or third home with ADU's. Close to many hiking trailheads and parks, and minutes away from the Altadena Town & Country Club, shopping, dining, and entertainment.