An artist's rendering depicts the Astoria on Tenth, currently under construction. (Arcus Developments)

A luxury penthouse condo is on the Calgary market for an unprecedented price of $10 million, propelling the city into a lofty real estate realm.

The west-facing, two-storey, 4,400-square-foot unit is part of the Astoria on Tenth Tower under construction in Calgary's Beltline neighbourhood.

The sticker price makes the 34th- and 35th-floor condo the priciest ever in Alberta and the third most costly in Canada, after listings in Toronto for $25 million and Vancouver for $18 million, Arcus Developments said Tuesday.

A second penthouse, which faces east, has already been sold to a private buyer for an undisclosed amount, according to Caren Crisp, the company's marketing and communications manager.

"The Astoria on Tenth penthouses are a sign we've arrived as a city," said Gerry Mendyk, president and director of Arcus. "The city's never seen anything like them, and we feel now is the perfect time to introduce them."

The penthouses boast solid marble and ebony, crystal chandeliers, nine-metre arched windows and five balconies. The developer also highlighted luxury features including an 860-bottle private wine vault, media and billiards rooms and priority elevator service.

The Astoria penthouses will boast arched windows and crystal chandeliers, says the developer. (Arcus Developments)

The building on the 900 block of 10th Ave S.W. will also have a movie theatre for owners, said Mendyk.

The developer said more than half of the building's 225 suites have been sold. Occupancy is scheduled for 2010.

Last week, a six-bedroom house in Crescent Heights sold for $7.5 million, breaking the record for the top MLS residential sale in Calgary.

The previous record was set in May when a Mount Royal bungalow sold for $4.8 million.