The project awaits final approval from the Easton Historic District Commission on Monday, said Mayor Sal Panto.
The site will give Easton a centralized bus space for commuters and visitors at the former home of the Marquis Theatre and Perkins Restaurant and Bakery, near the intersection with Larry Holmes Drive and South Third Street.
The city is developing the project through a partnership with the state and the Lehigh and Northampton Transit Authority.
Site prep construction starts in April, with footers and foundations installed in May and pre-cast concrete for the parking deck will start in July, followed by construction on the three-story building, said Panto.
"We expect the deck to be done in the fall of 2014," said Panto. The intermodal facility should open in early 2015, he added.
The facility can park up to eight buses at one time. Currently, the city has just two bus shelters, with a transfer point on the west side of Centre Square in Easton.
The first floor will be for the transit center and 2,500 square feet on this floor will offer space for a retail/commercial business facing Third Street.