Ah well I mean if the site is being cleared right now and considering the main tower itself was approved then I have to assume it's gearing up for construction, if I were willing to bet it will be underway by July.
more likely this is for the affordable housing on the south portion of the block
Here's a look at where the affordable housing at 200 Folsom St (Transbay Block 2) will be. No demolition for anything on the Block 4 side or where the park will be.