This post originally appeared on Seattle magazine’s website.

Last week, defying early expectations that she would abandon the planned downtown Seattle streetcar after pausing construction nearly a year ago, Mayor Jenny Durkan announced that she would ask the city council to proceed with the project. The caveat? The council will need to come up with additional $65 million to help the Seattle Department of Transportation pay for the project, whose price tag has swelled to an estimated $285.8 million from an original estimate of $134.9 million. (The city’s utility departments will have to come up with another $23 million for utility work that the city says is long overdue with or without the streetcar project.)

In 2015, the city’s estimated cost for the streetcar was $143 million; in 2017 it went up to $197 million; and last August, the estimate was $252 million.

This streetcar line, known as the Center City Connector, would connect the two existing streetcar lines: one that travels from Pioneer Square to First Hill and the other that goes from Westlake through South Lake Union. In doing so, it would create an almost-complete loop from First Hill to South Lake Union.

The latest budget increase is the result of delays to the project timeline (besides the 10-month pause in the project, the city now estimates that it will take 18 months for the Federal Transit Administration to review the project for funding—see below for more details—pushing the opening date from 2022 to 2025); extra costs that Durkan says SDOT failed to account for under her predecessor, Ed Murray, including a new maintenance facility and bridge reinforcements; and the need for large ongoing operations subsidy, which could swell to $19 million a year by the second full year the center city streetcar is in operation.

“It is clear now that the previous SDOT management in the last administration had failed to do the proper due diligence to account for all the costs,” Durkan said in a statement. “As a result, this project was not set up for future long-term financial success[.]”

So what does last week’s announcement mean, and what happens now? We’ve put together some questions and answers to explain where the streetcar goes from here.

Does last week’s announcement mean the streetcar will actually be built?

The streetcar still faces a number of hurdles, including the need for funding at the city and state levels. In December, the Federal Transit Administration told the city that the project remained in the running for a $75 million federal Small Starts grant, but the federal funding is not yet secure; without it, the total SDOT funding gap will be $140 million.

Even assuming a smaller shortfall, the city will have to come up with at least $65 million in additional funding, possibly by issuing bonds against an existing revenue source such the commercial parking tax, or as part of a future transportation levy. The city council will now have to work with the mayor’s office, and incoming SDOT director Sam Zimbabwe, to find a source for the additional funding.

Why was there a delay in the first place?

Durkan halted the streetcar project last March after a preliminary review of the project found that costs had ballooned to more than $200 million. The nine-month pause allowed outside evaluators to analyze the cost to build and operate the system as well as SDOT’s engineering work on the project, which a spokeswoman from Durkan’s office says did not include the cost of reinforcing several bridges in Pioneer Square that will need to be strengthened to carry the heavier new trains—which are already on order and weigh about 12 tons more than the existing streetcars.