Aspen Manor is a luxury mountain retreat designed by Charles Cunniffe Architects, situated on four acres at the base of Red Mountain in Aspen, Colorado’s posh Starwood neighborhood. At approximately 20,000 square feet, this stone-and-stucco Bavarian-style house utilizes as much glass as possible to encompass the views, all the while creating a warm, mountain escape for the owners. The Owner’s philanthropic engagements lead to programming to include spaces for sizable party tents, valet, catering, staff accommodations and lavish guests suites. The design includes 12 bedrooms, gourmet kitchen with butler’s pantry, an office, wine cellar and tasting room, gym, pilot’s quarters, pool and outdoor entertaining areas and a guest house.

The retreat is perched on a hill with a 70-mile panorama of snow-capped mountains. Outside a slate patio includes a pizza oven and entertainment area next to an Infinity swimming pool. A hot tub edged by large rocks is fed by a stream that runs under a wooden bridge.

The couple, pictured here, bought the property in 2006 for $20 million before embarking on a multi-million-dollar renovation. Mr. Powers, 53, was formerly a managing director and senior portfolio manager of Pacific Investment Management Co. (PIMCO). Mrs. Power’s grandparents owned the Mississippi Delta plantation Dockery Farms. She is a trustee of the farm, now a historical site, and also funds a program that provides music education to children in the South.

Aspen interior designer Linda Bedell says it went from “overdone, Los Angeles nouveau riche” to the look of “a grand European country house.”

In the “Grand Room,” a wide open living room with 50-foot-high wood beam ceilings, a Joan Miro tapestry hangs above a vast stone fireplace.

Ms. Powers’ office includes an Andy Warhol painting.

Inside, the views compete with a top-shelf contemporary art collection. It starts in the entry, shown here, where a large Roy Lichtenstein oil hangs on gray cashmere-covered walls.

Photos: Charles Cunniffe Architects & Shawn O’Connor Photography