12: percent of San Franciscans surveyed by the Tuolumne River Trust who knew that the Tuolumne River was the source of water for the Hetch Hetchy reservoir . . . 64: percent of litter that was tobacco or tobacco products found on a four-block stretch of Polk Street on a one-day survey conducted by an app called Rubbish . . . $2,500 per square foot: amount buyers will need to pay for new “ultra-luxury” condos in the under-construction One Steuart Lane project downtown; that is about double what a luxury condo unit usually sells for in the city, according to the San Francisco Business Times . . . $250,000: amount of a donation from Salesforce that was rejected by a nonprofit that provides immigrant legal services; the nonprofit said first Salesforce has to cancel its contracts with Customs and Border Protection . . . 2,900/-100: The number of jobs gained or lost in June by Santa Clara County and San Francisco-San Mateo, respectively.