Real estate mogul Victor MacFarlane has placed his huge St. Regis penthouse on the sales block for $70 million, a figure that would obliterate the previous record price tag for a San Francisco residence.

Commandingly sited atop the highest floors of the Five-Star St. Regis Hotel & Residences in San Francisco, this one-of-a-kind, palatial penthouse features over 20,000 expansive square feet, including 2,900 square feet of terraces – one of the largest personal residences in all of San Francisco.

The property also features 2,900 square feet of terraces with 360-degree views of many San Francisco landmarks. Glass walls also offer plenty of light and the foyer has a winding staircase and two-story waterfall.

There are six bedrooms, seven baths, four powder rooms, four fireplaces, two offices, a wine storage room, a gym with a sauna and steam room and a 13-seat cinema. It is definitely one of the most striking apartments in the country.

The asking price for the completed condo works out to $3,500 for each of the roughly 20,000 square feet. MacFarlane bought the property, originally three unfinished units on the top two floors, for about $30 million in late 2005.

The question remains, however, whether anyone will be willing to pay that much for one now.

(The Ohio-born MacFarlane is the chief executive officer of MacFarlane Partners, a San Francisco real estate investment firm with $11 billion under management. He has been managing money for the California Public Employees Retirement System since the early 1990s.)