The penthouse where prodigious Denver developer John W. Madden Jr. lived for decades was relisted earlier this month for $3 million, offering a glimpse into the personal sanctuary of the man who shaped the Denver Tech Center skyline. The 5,500-square-foot residence, perched atop the office building at 5700 S. Quebec St. in Greenwood Village, is perhaps the only penthouse in the Denver metro area built atop a commercial office building. With three bedrooms and four bathrooms, the property offers something rare in urban development: nearly an acre of private outdoor space with unobstructed Front Range views. “It’s very special. One of a kind,” said listing agent Anne Dresser Kocur of LIV Sotheby’s International Realty. “You feel like you’re on top of the world … yet you’re in the center of Greenwood Village.” Madden, who died in 2024 at age 94, previously tried to sell the penthouse for $6.8 million in 2021. Madden built the office building in the late 1970s and added the residential penthouse as an afterthought during construction. Son J. Madden called his parents “characters” who left a home near Castle Rock for the urban penthouse. The elder Maddens, who also spent time in Florida, lived there for more than 40 years without making major updates. That makes the current space, with no load-bearing walls, the perfect canvas, Kocur said. She had a series of renderings created to better showcase the space’s potential. In addition to a private elevator, the penthouse features skylights throughout, hardwood floors, Italian travertine tilework,…
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