The 955 Market Street building that was once home to Burning Man headquarters, and then a whole bunch of WeWork offices, is now empty and just sold for a measly 10% of the price it fetched in 2016.Let’s look back to the days of 2016, when the 16-story office building at 995 Market Street was on the market for sale, drawing the San Francisco Business Times headline “WeWork’s Mid-Market landlords prepare to cash in.” The Burning Man office headqua…