A fence went up a couple weeks ago, but they still appear to be a couple weeks short of a shoring permit. The block appears to be 1,179 units and about 1,100 parking spaces for the housing, plus a bit of parking for the Seattle Times who has offices in an old building next door. That's an unusually large parking ratio. It used to be more...they dropped the parking amount a bit in later design iterations (typically you MUP the worst-case scenario, then reduce parking depending on your assessment of the market).
The second block appears to be well behind the first, but they're demolishing the site, aside from the protected part of the old Times building. It'll be a huge convenience to have the extra site for construction.
My hope is the second block will start midway through the first. Like a year away maybe? The utility of the spare site will reduce once they have the below-grade and some of the lowrise stuff built. This block has shorter zoning, but they get some bonus for saving the existing park on the first block (in rendering). I think the second block is about 900 units and towers of 29 and 36 stories, or that was one version. Meanwhile the City is doing small upzones so maybe they'll use that.
Here's a giant design presentation for the first block, dating to May 2016.
http://www.seattle.gov/dpd/AppDocs/G...endaID5872.pdf