It was PRIVATE land, zoned for OFFICES, owned by SALEFORCE, then sold to the Warriors. And 50% of the land is still being used for corporate offices (Uber HQ will occupy it).
Not sure what closed doors you're talking about.
The Warriors stadium is literally a gold standard and a model that other sports teams should follow. Not only did they pay out of pocket, but they donated millions to the city to help manage traffic in the area.