Actually, they did. Times Square was not some place you wanted to take your kids to as late as the mid 80's. Cleaning up the city was a big campaign promise fo

Actually, they did. Times Square was not some place you wanted to take your kids to as late as the mid 80's. Cleaning up the city was a big campaign promise for several successive mayors. And San Francisco is NOT in Silicon Valley, it's 50 miles north of the actual valley. All of the major tech companies were setting up shop in the South Bay and peninsula 15-20 years ago. Successive SF mayors have lured tech companies north with various incentives.