It took Fremont and Union City more than a decade to agree on building Route 84. Now it looks like it could take just as long to build it.

Cost estimates for the road, which would span from Mission Boulevard in Union City to Paseo Padre Boulevard in Fremont, have increased from $136 million in 2004 to $211 million.

That means the project now has a big, fat deficit. And to plug it, the Alameda County Transportation Authority needs about $43 million either from the state or from the cities.

Fremont mayor Bob Wasserman said Fremont’s not chipping in. “What I would say is if that’s going to be the contribution then you’re going to be waiting a lot longer than 2013 to finish that project,” the mayor told county planners. “We don’t have that type of money.”

As Wasserman alluded, the project is scheduled to be completed in 2013. But, if there’s not enough money the project could be built in phases or delayed altogether.

The road, which will help motorists travel from I-880 to Union City’s proposed high-rise housing development, has always been a sore spot between the two cities. Union City wanted a new road going all the way to the freeway, but Fremont objected.