More than 4,000: number of turkeys given away by Mayor London Breed and various city government departments as part of the 12th annual Mayor’s Turkey Giveaway shortly before Thanksgiving . . . 17,000: predicted number of SantaCon revelers in Union Square on Dec. 8, according to a permit request to San Francisco; the city said no . . . 22 percent: amount of China’s urban housing stock that is unoccupied, according to new research; that amounts to more than 50 million empty homes . . . 69 percent: amount increase in San Francisco’s senior population between 2010 and 2030 . . . 80 percent: amount of San Francisco homes valued at more than $1 million . . . 3.6 percent: amount of homes nationwide that are worth more than $1 million.