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The topping off of the tallest new building in Boston in 40 years started out 742 feet below, at ground level. There construction workers, members of the development team, and local officials gathered to celebrate a milestone in the construction of the Four Seasons One Dalton in the Back Bay Tuesday. They then rode up construction elevators for a look around.

When the 61-story hotel-and-condominium building is finished next year, the penthouses — with stratospheric prices of $40 million — will be the highest place you can live in all of Boston.

If that’s your bag, and your price range, move fast, though. A spokeswoman for developer Carpenter & Co. said a number of units are already under contract, and the company expects all 160 condos to be sold by the time the building opens.

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Developer Dick Friedman and Mayor Martin Walsh surveyed the view from the 59th floor.
Developer Dick Friedman and Mayor Martin Walsh surveyed the view from the 59th floor.David L. Ryan/Globe Staff
Abigail Summerville took a photo out the 59th floor window of One Dalton.
Abigail Summerville took a photo out the 59th floor window of One Dalton.David L. Ryan/Globe Staff
The top of One Dalton provides a spectacular view of the Back Bay and the Boston skyline.
The top of One Dalton provides a spectacular view of the Back Bay and the Boston skyline.David L. Ryan/Globe Staff
Construction workers found shade during the topping off ceremony at the Christian Science Church complex.
Construction workers found shade during the topping off ceremony at the Christian Science Church complex.David L. Ryan/Globe Staff

Tim Logan can be reached at tim.logan@globe.com. Follow him on Twitter @bytimlogan.