Photo provided by the developer.  Photographer: John Horner.
Photo provided by the developer. Photographer: John Horner.

The developers of the Clarendon said that with the sale of a $6.2 million penthouse, the Back Bay building of 103 luxury condo and penthouse residences is now 100 percent sold.

The developer is Related Beal, a partnership between Related Cos., a national real estate development and investment firms, and the Beal Cos. LLP, a Boston real estate development and investment firm with a long history.

“The sellout of the Clarendon is an extremely significant marker for Related Beal and further evidences the desirability of downtown Boston as a residential location,” Bruce A. Beal, chairman of Related Beal, said in a statement. “Our accomplishments and success at the Clarendon provide a preview for what the Boston community can expect from Related Beal in the future.”

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The Clarendon’s first condos went on the market in 2010. The condos and penthouses did not go on the market all at once, but rather in phases.

The 33-story building at Clarendon and Stuart streets is divided into two parts with two separate names. The Clarendon is the name of the upper floors made up of luxury condos and penthouses. One Back Bay, the building’s rental property, has a separate entrance, features luxury apartments from the third to 14th floors.

Earlier this year, a penthouse at the Clarendon set a record. The $6.5 million sale of a penthouse worked out a price of $1,834 per square foot. At the time, that was a record for a luxury new-construction high-rise condo, Related Beal said.