A major Philadelphia construction project appears to be slipping a bit behind schedule. 

Work began on Dilworth Plaza, on the west side of Philadelphia City Hall, in January 2012. Paul Levy of the Center City District says by this summer, passers-by will finally see major progress above ground.

"The project is very much on schedule for completion next summer," he said. "We are still in the underground phase, where we are still adding elevators and improving the concourse, but if you go by the plaza now you will see we have laid all the foundations and the beginning walls for the concourse level."

Levy says the summer 2014 completion date is not as soon as expected.

"Well, we've said spring, and spring goes through June," Levy said. "I think we are still in that same phase of June-July ... we're just being cautious because we are still in the demolition and underground phase.

"I say by June, we will be much more precise as to when we are prepared to open to the public."

Levy says the finishing touches won't begin until early 2014.