Construction of a 47-story condo and retail tower at Copley Place is indefinitely on hold.

Simon Property Group said it hopes to provide a detailed plan by next spring, but a but a timeline for the 318-unit skyscraper, has yet to be specified. The delay is unusual, given the improved market conditions for commercial construction and demand for condominiums. Neighbors and some officials said Simon Property is failing to explain the hold-up.

Simon has not been heard from in six months, said the Massachusetts Department of Transportation. The project is complex as it would be built on state-owned air rights over the Mass Turnpike, which requires additional review to verify the existing decking could support the tower.

Other major residential projects around the city are getting underway, taking advantage of a condo market in Boston where sales were up more than 25 percent in the third quarter.

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