Construction won’t begin on the ambitious Penn Centre proposal for at least a few more months, but the project still is a go, said developer J. Greg Allen, who also is renovating Jefferson Plaza. Allen said his team is waiting on the Ballard administration. The new mayor has put a hold on most projects that are seeking city incentives. A meeting with the mayor is set for mid-March, Allen said. Plans call for two towers with two hotels, dozens of condos and up to six restaurants along Pennsylvania Street across from Conseco Fieldhouse. The developers had hoped to break ground in October 2007, then set a target of January. “Hopefully we’ll be moving again here real quickly,” Allen said.