As Palo Alto prepares to create a new residential community along San Antonio Road, city leaders are confronting a question that had dogged prior planning efforts: How much office space should the new neighborhood accommodate? The focus on the debate is on what’s known as the CTI subarea next to U.S. Highway 101 and just north of East Charleston Road. The CTI subarea, which is just south of San Antonio Road and includes Commercial Street, Transp…