Local News, West In a city where rising rents increasingly displace low-income residents, one San Francisco block’s rapid change triggers fear and hope Aug 19, 2015, 9:04 AM 0 By Meira Gebel Mission Local Walking on San Carlos between 18th and 19th streets, 76-year-old Jerry Avila points to changes he has seen on the block where he has lived for more than 30 years. For most of that…