This extraordinary home literally stops the architectural clock .

The Clocktower Penthouse in San Francisco is a registered landmark with a rich history: It was the original site of the Max Schmidt Lithography Co., the West Coast’s largest printing company in the 1920s, according to TopTenRealEstateDeals.com.

It has since been remodeled into a unique and modern penthouse. The two-bedroom, two-bath, 3,000-square-foot space spans four floors, and includes a master suite, multiple living areas, and the unique clock room.

The unique architecture and design of the home speaks for itself, including built-in bookcases concrete floors and industrial beams.

The 1,300-plus-square-foot wraparound deck offers stunning, sweeping views of the city.

For $6 million, you would never want to turn back time on this home.

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