I wouldn't be too worried.
They had an RFP for the project through OCII that ended 5/2:
http://sfocii.org/rfps-rfqs-bids
And they just received their shoring permits on 5/6:
http://dbiweb.sfgov.org/dbipts/defau...&ShowPanel=BID
Now that they've wrapped up the above items, I'd expect activity within the month.