It appears that Bellevue is directly on the hook for $100m in costs. A further $60m may be partially waived (Section 4.2c) if there are savings on particular parts of the project. However, if ST has to cut its expenditures it can do so by deferring stations, parking lots, and so on without affecting the city’s contribution.
The grade separation modifications in Segment B are approved pending an environmental review.
Other documents are here. A big element of political risk to the project just went away.